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The circular boundary of the concave mir...

The circular boundary of the concave mirror subtends a cone of half angle `theta` at its centre of curvature. The minimum value of `theta` for which any ray incident on this mirror parallel to the principal axis suffers reflection more than once is
.

A

`30^(@)`

B

`45^(@)`

C

`60^(@)`

D

`75^(@)`

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The correct Answer is:
B
.
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RESONANCE ENGLISH-DAILY PRACTICE PROBLEM-DPP No.7
  1. A convex mirror of radius of curvature 20 cm is shown in figure. An ob...

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  2. The focal length of a concave mirror is f and the distance from the ob...

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  3. A point object is moving along principal axis of concave mirror with u...

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  4. The refractive index of air with respect to glass is 2//3. The refract...

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  5. A mango tree is at the bank of a river and one of the branch of tree e...

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  6. The circular boundary of the concave mirror subtends a cone of half an...

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  7. In the figure shown. A particle P moves with velocity 10 m//s towards ...

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  8. A metal coin at the bottom of a beaker filled with a liquid of refrac...

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  9. A microscope is focussed on a mark on a piece of paper and then a slab...

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  10. The speed of light in media M(1) and M(2) is 1.5xx10^(8) m/s and 2.0x...

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  11. A ray of light travelling in a transparent medium of refractive index ...

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  12. If the figure below, PQRS denotes the path followed by a ray of light ...

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  13. A beam of light travelling with speed c in vacuum encounters a glass m...

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  14. The acceleration of a particle travelling along a straight line is a =...

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  15. Let r and r^(') denote the angles iniside an equilateral prism, as usu...

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  16. A ball is released from the top of a tower of height h meter. It take...

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  17. Car A and car B move on a straight road and their velocity versus time...

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  18. A particle travels from A to B path shown in figure, then the displace...

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  19. Variation of displacement x of a particle moving on a straight line wi...

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  20. A particle is moving in a straight line whose acceleration versus time...

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