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Calculate the focal length of a reading ...

Calculate the focal length of a reading glass of a person if his distance of distinct vision is 75 cm.

A

75.2 cm

B

25.6 cm

C

100.4 cm

D

37. 5 cm

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  6. A person can see clearly objects only when they lie between 50 cm and ...

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  7. Two convex lenses of focal lengths f(1)andf(2) form images with magnif...

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  8. The equiconvex lens has focal length f. If is cut perpendicular to the...

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  9. A plano-convex lens is made of material having refractive index 1.5. T...

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  10. A convex lens (with material of refractive index of 3/2) has two surfa...

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  11. A double convex lens has focal length 25 cm. The radius of curvature o...

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  12. The power of a biconvex lens is 10 dioptre and the radius of curvature...

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  13. A convex lens of glass (mu=1.5) has a focal length of 8 cm when placed...

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  14. A convex lens of glass (mu(g)=1.45) has focal length f(g) is air. The ...

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  15. A thin convex lens made from crown glass (mu=(3)/(2)) has focal f. Whe...

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  16. Two similar thin equiconvex lenses, of focal length f each, are kept c...

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  17. Two identical thin plano-convex glass lenses (refractive index 1.5) ea...

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  18. A plnao=convex lens fits exactly into a plano-concave lens. Their plan...

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  19. A plano-convex lens fits exactly into plano-concave lens as shown in t...

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  20. A comvex lens and a concave lens are placed in contact. The ratio of m...

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