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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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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 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
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Gamma Question Bank for Engineering Physics>Chapter 26 - Ray Optics and Optical Instruments>EXERCISE 9.5>Q 26
A thin convex lens of focal length 20 cm is kept in contact with a plane mirror. The focal length of the combination will be
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Gamma Question Bank for Engineering Physics>Chapter 26 - Ray Optics and Optical Instruments>EXERCISE 9.5>Q 27
Two lens of power +4D and -2D are placed in contact to form an achromatic doublet. The ratio of their dispersive power is
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Gamma Question Bank for Engineering Physics>Chapter 26 - Ray Optics and Optical Instruments>EXERCISE 9.5>Q 28
A lens made of glass of refractive index 1.5 has focal length 25 cm. Its focal length in water will be μw=43
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Gamma Question Bank for Engineering Physics>Chapter 26 - Ray Optics and Optical Instruments>EXERCISE 9.5>Q 29
A concave mirror of focal length 30 cm in air is immersed in water μ=43. The focal length of the mirror in water will be