59.A person uses +1.5 D glasses to have normal vision from 25 cm onwards. He uses a 20 D lens as a simple microscope to see an object. What will be the maximum magnifying power, is he uses the microscope together with his glasses (A) 6 (B) 3 (C) 10 (D) 9

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Q. A lady uses

+ 1.5 D

glasses to have normal vision from

25 c m

onwards. She uses a

20 D

lens as a simple microscope to see an object. The maximum magnifying powers if she uses the microscope (a) together with the glasses and (b) without the glasses are

Q. A lady uses

+ 1.5 D

glasses to have normal vision from

25 cm

onwards. She uses a

20 D

lens as a simple microscope to see an object. The maximum magnifying power if she uses the microscope together with her glass is (Integer only)

Q. A lady uses

+ 1.5 D

glasses to have normal vision from

25 c m

onwards. She uses a

20 D

lens as a simple microscope to see an object. The maximum magnifying powers if she uses the microscope (a) together with the glasses and (b) without the glasses are

A man with normal near point (25 cm) reads a book with small print using a magnifying glass: a thin convex lens of focal length 5 cm.

(a) What is the closest and the farthest distance at which he should keep the lens from the page so that he can read the book when viewing through the magnifying glass?

(b) What is the maximum and the minimum angular magnification (magnifying power) possible using the above simple microscope?

Q. The magnifying power of a simple microscope is given by

1 + \frac{D}{f},

where D is the least distance for clear vision. For farsighted persons, D is greater than the usual. Does it mean that the magnifying power of a simple microscope is greater for a farsighted person as compared to a normal person? Does it mean that a farsighted person can see an insect more clearly under a microscope than a normal person?

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