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JEE-Main - Grade 12 - Physics - Ray Optics and Optical Instruments - Introduction and Snapshot of Ray Optics and Optical Instruments - Study ref# 830

Introduction: Nature has endowed the human eye (retinal) with the sensitivity to detect electromagnetic waves within a small range of the electromagnetic spectrum. Electromagnetic radiation belonging to this region of the spectrum (wav... read more

JEE-Main - Grade 12 - Physics - Ray Optics and Optical Instruments - Introduction and Snapshot of Ray Optics and Optical Instruments - Study ref# 831

Following sections must be covered to understand the  Ray Optics and Optical Instruments: 1. Introduction 2. Reflection of Light by Spherical Mirrors 3. Refraction 4. Total Internal Reflection 5. Refraction at Spherical S... read more

JEE-Main - Grade 12 - Physics - Ray Optics and Optical Instruments - Target Setup for Ray Optics and Optical Instruments - Study ref# 832

Student requires to achieve the following milestones to get better grip over Ray Optics and Optical Instruments. The milestones / targets are as follows: Starting Point: Days 0Test TypeAppear on TestTarget TestsScorePractice Test... read more

JEE-Main - Grade 12 - Physics - Ray Optics and Optical Instruments - Study ref# 10603

The phenomena involved in the reflection of radio waves by ionosphere are similar to (a) reflection of light by a plane mirror (b) total internal reflection of light in air during a mirage. (c) dispersion of light by water molecules... read more

JEE-Main - Grade 12 - Physics - Ray Optics and Optical Instruments - Study ref# 10604

The direction of ray of light incident on a concave mirror is shown by PQ while directions in which the ray would travel after reflection is shown by four rays marked 1, 2, 3 and 4 (figure). Which of the four rays correctly shows the directi... read more

JEE-Main - Grade 12 - Physics - Ray Optics and Optical Instruments - Study ref# 10605

An object approaches a convergent lens from the left of the lens with a uniform speed 5 m/s and stops at the focus. The image (a) moves away from the lens with an uniform speed 5 m/s. (b) moves away from the lens with an uniform acc... read more

JEE-Main - Grade 12 - Physics - Ray Optics and Optical Instruments - Study ref# 10606

When an object is placed between f and 2f of a concave mirror, would the image formed be (i) real or virtual and (ii) diminished or magnified? Answer: (i) Real, (ii) magnified.... read more

JEE-Main - Grade 12 - Physics - Ray Optics and Optical Instruments - Study ref# 10607

Which mirror does have a real focus? Answer: Concave mirror. In concave mirror, parallel rays after reflecting from mirror actually meet at focus.... read more

JEE-Main - Grade 12 - Physics - Ray Optics and Optical Instruments - Study ref# 10608

Why are convex mirror preferred over plane mirrors as rear view mirrors? Answer: Convex mirror is preferred over plane mirrors as rear view mirrors because as it gives diminished image of object and hence can cover larger field of view.... read more

JEE-Main - Grade 12 - Physics - Ray Optics and Optical Instruments - Study ref# 10609

Name the mirror which are used in (i) Security mirror (ii) Solar furnace Answer: (i) Convex mirror (ii) Concave mirror.... read more

JEE-Main - Grade 12 - Physics - Ray Optics and Optical Instruments - Study ref# 10610

An object AB is kept in front of a concave mirror as shown in the figure. (i) Complete the ray diagram showing the image formation of the object. (ii) How will the positional and intensity of the image be affected if the lower half... read more

JEE-Main - Grade 12 - Physics - Ray Optics and Optical Instruments - Study ref# 10611

A concave (or convex mirror) is held under water. Will its focal length change? Answer: No, The focal length of small aperture mirror is half of its radius. It does not depend upon the refractive index of the surrounding medium.... read more

JEE-Main - Grade 12 - Physics - Ray Optics and Optical Instruments - Study ref# 10612

(i) Calculate the distance of an object of height  from a concave mirror of radius of curvature 20 cm, so as to obtain a real image of magnification 2. Find the location of image also. (ii) Using mirror formula, explain why does a conv... read more

JEE-Main - Grade 12 - Physics - Ray Optics and Optical Instruments - Study ref# 10613

(i) A mobile phone lies along the principal axis of a concave mirror. Show, with the help of a suitable diagram, the formation of its image. (ii) Explain why magnification is not uniform. (iii) Suppose the lower half of the concave ... read more

JEE-Main - Grade 12 - Physics - Ray Optics and Optical Instruments - Study ref# 10614

Show that the spherical mirror formula holds equally to a plane mirror. Answer: Using mirror formula   For plane mirror   Hence                             So,                    ... read more

JEE-Main - Grade 12 - Physics - Ray Optics and Optical Instruments - Study ref# 10615

(i) Prove that for a concave mirror, the radius of curvature is twice the focal length for small aperture as compared to its radius of curvature. Answer: (i) Let us consider  as smal... read more

JEE-Main - Grade 12 - Physics - Ray Optics and Optical Instruments - Study ref# 10616

A passenger in an aeroplane shall (a) never see a rainbow. (b) may see a primary and a secondary rainbow as concentric circles. (c) may see a primary and a secondary rainbow as concentric arcs. (d) shall never see a secondary rainbo... read more

JEE-Main - Grade 12 - Physics - Ray Optics and Optical Instruments - Study ref# 10617

The optical density of turpentine oil is higher than that of water while its mass density is lower. Figure shows a layer of turpentine floating over water in a container. For which one of the four rays incident on turpentine in Figure, the p... read more

JEE-Main - Grade 12 - Physics - Ray Optics and Optical Instruments - Study ref# 10618

A short pulse of white light is incident from air to a glass slab at normal incidence. After travelling through the slab, the first colour to emerge is (a) blue                        (b) green (c) violet                       (d) red... read more

JEE-Main - Grade 12 - Physics - Ray Optics and Optical Instruments - Study ref# 10619

There are certain materials developed in laboratories which have a negative refractive index (figure). A ray incident from air (medium 1) into such a medium (medium 2) shall follow a path given by: (a) (b) (c) (d) ... read more

JEE-Main - Grade 12 - Physics - Ray Optics and Optical Instruments - Study ref# 10620

How does the angle of minimum deviation of a glass prism vary, if the incident violet light is replaced by red light? Give reason. Answer: (i) Decreases (ii)   Detailed Answer: We ... read more

JEE-Main - Grade 12 - Physics - Ray Optics and Optical Instruments - Study ref# 10621

Why does sun appear red at sunrise and sunset? Answer: At the time of sunrise or sunset, sun is at horizon. Hence sunrays have to travel longer distance before reaching to our eye. During this travel shorter wavelength get scattered as we re... read more

JEE-Main - Grade 12 - Physics - Ray Optics and Optical Instruments - Study ref# 10622

Define the power of a lens. Write S.I. unit. Answer: The power of a lens equals to the reciprocals of its focal length (in meter). Also accept   Power of a lens is the ability of conversion/ diversion of the rays incident on the len... read more

JEE-Main - Grade 12 - Physics - Ray Optics and Optical Instruments - Study ref# 10623

(i) What is the relation between critical angle and refractive index of a material? (ii) Does critical angle depend on the colour of light? Explain. Answer: (i) Refractive index (n) =   where, C is the critical angle. (ii) Yes, Since, ... read more

JEE-Main - Grade 12 - Physics - Ray Optics and Optical Instruments - Study ref# 10624

(i) Define refractive index of a medium. (ii) In the following ray diagram, calculate the speed of light in the liquid of unknown refractive index. Answer: (i) Refractive index of a medium is the ratio of speed of light (c) in free space... read more

JEE-Main - Grade 12 - Physics - Ray Optics and Optical Instruments - Study ref# 10625

Under what condition does a biconvex lens of glass having a certain refractive index act as a plane glass sheet when immersed in a liquid? Answer: When the refractive index of glass is equal to the refractive index of the liquid. (Alterna... read more

JEE-Main - Grade 12 - Physics - Ray Optics and Optical Instruments - Study ref# 10626

A ray of light falls on a transparent sphere with center C as shown in the figure. The ray emerges from the sphere parallel to the line AB. Find the  angle of refraction at A, if refractive index  of the material of the sphere is read more

JEE-Main - Grade 12 - Physics - Ray Optics and Optical Instruments - Study ref# 10627

A ray PQ incident normally on the refracting face BA is refracted in the prism BAC made of material of refractive index 1.5. Complete the path of ray through the prism. From which face will the ray emerge? Justify your answer. Answer: ... read more

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