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A concave mirror gives an image thre...

A concave mirror gives an image three times as large as the object placed at a distance of 20 cm from it . For the image to be real , the focal length should be-

A

`-10 cm `

B

` -15 cm `

C

` -20 cm `

D

` - 30 cm `

Text Solution

Verified by Experts

The correct Answer is:
B
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MOTION-RAY OPTICS-Exercise-1
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  5. A ray of light travels from air to glass. It is found that the angle o...

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  6. If mu0 be the permeability and k0 , the dielectric constant of a mediu...

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  7. Monochromatic light of frequency 5xx10^(14) Hz travelling in vacuum en...

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  10. A ray of light travels through a transparent slab with a speed of 2 x...

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  11. The refractive index of material varies with wavelength according to t...

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  16. The ratio of the refractive index of red light to blue light in air is

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  17. The refractive index of a piece of transparent quartz is the greatest ...

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  18. The refractive index of a certain glass is 1.5 for light whose wavelen...

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  19. When light travels from one medium to the other of which the refractiv...

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  20. A monochromatic beam of light passes from a denser medium into a rarer...

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