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Which of the following graph is best representation of variation of magnification m with distance of object u for a concave mirror of focal length 10 cm if image is virtual?

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Important Questions on Ray Optics and Optical Instruments

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Gamma Question Bank for Engineering Physics>Chapter 26 - Ray Optics and Optical Instruments>EXERCISE 9.3>Q 12

In the shown figure ∠r is equal to

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Gamma Question Bank for Engineering Physics>Chapter 26 - Ray Optics and Optical Instruments>EXERCISE 9.3>Q 13
A ray of light strikes a glass plate at an angle 60°. If reflected and refracted rays are perpendicular to each other, then refractive index of the glass will be
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Gamma Question Bank for Engineering Physics>Chapter 26 - Ray Optics and Optical Instruments>EXERCISE 9.3>Q 17
To an underwater swimmer at depth 12 below the surface of water a bird at height 18 m above the surface of water appears at height h above the surface of water, then h is equal to
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Gamma Question Bank for Engineering Physics>Chapter 26 - Ray Optics and Optical Instruments>EXERCISE 9.3>Q 18
If a parallel beam of light of circular cross-section having radius 10 mm falls on the surface of glass slab μ=32 at an angle 30° with the surface of slab, then the radius of refracted beam is about
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Gamma Question Bank for Engineering Physics>Chapter 26 - Ray Optics and Optical Instruments>EXERCISE 9.3>Q 19
In the path of a beam converging towards a point on screen a glass plate of thickness $t$ is placed. The convergence point will shift by [μ→ refractive index of material of slab]
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Gamma Question Bank for Engineering Physics>Chapter 26 - Ray Optics and Optical Instruments>EXERCISE 9.4>Q 20
A ray of light is incident on a glass sphere at an angle α. Angle of refraction, at the surface on which it is incident, is β. What is the angle by which the ray is deviated as it comes out of the sphere?
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Gamma Question Bank for Engineering Physics>Chapter 26 - Ray Optics and Optical Instruments>EXERCISE 9.4>Q 21
The minimum distance between a point object and its real image formed by a convex lens of focal length f is
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Gamma Question Bank for Engineering Physics>Chapter 26 - Ray Optics and Optical Instruments>EXERCISE 9.4>Q 25
In lens displacement method lateral magnifications obtained are 2 and 0.5. If separation between position of lenses is 30 cm, then focal length of the lens is