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The distance of an object from a spheric...

The distance of an object from a spherical mirror is equal to the focal length of the mirror. Then the image:

A

must be at infinity

B

may be at infinity

C

may be at the focus

D

none

Text Solution

Verified by Experts

The correct Answer is:
B
Image formation by concave mirror when object is real & placed at focus f. forms image at infinity but not in other cases.
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ALLEN -GEOMETRICAL OPTICS-EXERCISE- 01
  1. A plane mirror is moving with velocity 4 (hat i) + 4 (hat j) + 8 (hat ...

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  2. In the figure shown, how many images of the star will an observer at O...

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  3. The distance of an object from a spherical mirror is equal to the foca...

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  4. A concave mirror of focal length 20 cm is cut into two parts from the ...

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  5. Radius of curvature of each mirror is R. 'O' is object. Consider first...

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  6. A convex mirror of focal length 'f' is placed at the origin with its r...

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  7. The x-z plane separates two media A and B of refractive indices mu(1)=...

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  8. A ray of light travelling in a medium of refractive index mu is incide...

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  9. Consider the situation shown in figure. Water (mu(W) = (4)/(3)) is f...

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  10. A plane mirror is placed at the bottom of the tank containing a liquid...

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  11. When a pin is moved along the principal axis of a small concave mirror...

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  12. A ray R(1) is incidnet on the plane surface of the glass slab (kept in...

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  13. Refractive index of a glass cube is sqrt(2). A ray of light is inciden...

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  14. A ray of light is travelling from a denser medium to rarer medium. For...

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  15. The distance of final image from AB as observed by observer is P is

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  16. What is the least radius through which an optical fiber of core diamet...

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  17. A ray of light from a denser medium strike a rarer medium at an angle ...

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  18. An object is immersed in a fluid. In order that the object becomes inv...

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  19. A ray of light is incident upon an air/water interface ( it passes fro...

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  20. A light ray is incident on a transparent sphere of index = sqrt(2) , a...

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