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An equilateral prism is placed on a hori...

An equilateral prism is placed on a horizontal surface. A ray PQ is incident onto it. For minimum deviation `

A

(a)PQ is horizontal

B

(b)QR is horizontal

C

(c)RS is horizontal

D

(d)Either PQ or RS is horizontal

Text Solution

Verified by Experts

The correct Answer is:
B
During minimum deviation the ray inside the prism is parallel to the base of the prism in case of an equilateral prism.
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ALLEN -GEOMETRICAL OPTICS-EXERCISE-05 (B)
  1. A ray of light is incident at the glass-water interface at an angle I,...

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  2. White light is incident on the interface of glass and air as shown in ...

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  3. An equilateral prism is placed on a horizontal surface. A ray PQ is in...

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  4. A point object is placed at the centre of a glass sphere of radius 6cm...

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  5. A container is filled with water (mu=1.33) upto a height of 33.25 cm. ...

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  6. A convex lens if in contact with concave lens. The magnitude of the ra...

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  7. A point object is placed at distance of 20 cm from a thin plane - con...

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  8. A biconvex lens of focal length f forms a circular image of radius r o...

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  9. A ray of light travelling in water is incident on its surface open to ...

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  10. In an experiment to determine the focal length (f) of a concave mirror...

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  11. Two beams of red and violet colours are made to pass separately throug...

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  12. A light beam is traveling from Region I to region IV (refer figure). T...

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  13. A ball is dropped from a height of 20 m above the surface of water in ...

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  14. A biconvex lens of focal length 15 cm is in front of a plane mirror. T...

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  15. A ray of light travelling in the direction (1)/(2)(hati+sqrt3hatj) is ...

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  16. The image of an object, formed by a plano-convex lens at a distance of...

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  17. A right angled prism of refractive index mu(1) is placed in a rectangu...

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  18. A point source S is placed at the bottom of a transparent block of hei...

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  19. Four combinations of two thin lenses are given in List I. The radius o...

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  20. Two identical glass rods S(1) and S(2) (refractive index=1.5) have one...

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