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An object is placed at 10 cm from a lens...

An object is placed at 10 cm from a lens and real image is formed with magnification of 0.5. Then the lens is

A

concave with focal length of 10/3 cm

B

convex with focal length of 10/3 cm

C

concave with focal length of 10 cm

D

convex with focal length of 10 cm

Text Solution

Verified by Experts

The correct Answer is:
B
We have `(1)/(f)=(1)/(v)-(1)/(u)rArr (1)/(+5)-(1)/(-10)=(1)/(f) " "(|v|=(|u|)/(2))`
`therefore` Focal length, `f=(10)/(3)cm`
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MHTCET PREVIOUS YEAR PAPERS AND PRACTICE PAPERS-RAY OPTICS-EXERCISE 1 (TOPICAL PROBLEMS)
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  2. Where should an object be placed from a converging lens of focal lengt...

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  3. An object is placed at 10 cm from a lens and real image is formed with...

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  4. The real image which is exactly equal to the size of an object is to b...

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  5. A plano-convex lens of curvature of 30 cm and refractive index 1.5 pro...

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  8. Two thin lenses of focal lengths f(1) and f(2) are in contact. The fo...

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  9. Two thin lenses, one of focal length + 60 cm and the other of focal le...

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  10. A convex lens of focal length 40 cm is in contact with a concave lens ...

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  11. Two similar plano-convex lenses are combined together in three differe...

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  12. Two thin lenses of focal lengths 20 cm and 25 cm are placed in a conta...

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  13. We combined a convex lens of focal length f(1) and concave lens of foc...

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  14. For a normal eye, the least distance of distinct vision is……..and far ...

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  15. When we see an object the image formed on the retina is

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  16. The focal length of a normal eye lens is about

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  17. An object is placed at a distance u from a simple microscope of focal ...

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  18. Magnifying power of a simple microscope is (when final image is formed...

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