Q1 of 52 Page 432

A person looks at different trees in an open space with the following details. Arrange the trees in decreasing order of their apparent sizes.

Let be the angle formed by the eyes while looking at tree, then,



For trees, A,B,C and D, the value of angle becomes-






When becomes more, the apparent sizes also becomes large.


Hence the sequence A, B, C, D


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 5

The focal length of the objective of a compound microscope is fo and its distance from the eyepiece is L. The object is placed at a distance u from the objective. For proper working of the instrument.

 2

An object is to be seen through a simple microscope of focal length 12 cm. Where should the object the placed so as to produce maximum angular magnification? The least distance for clear vision is 25 cm.

 3

A simple microscope has a magnifying power of 3.0 when the image is formed at the near point (25 cm) of a normal eye. (a) What is its focal length? (b) What will be its magnifying power if the image is formed at infinity?