Question

You have been given four convex lenses of focal length 35 cm, 25 cm,
8 cm and 4 cm. Which two convex lenses will you select for designing a
compound microscope for maximum magnifying power and why ?​

Answer 1

Answer:

The obejective of a telescope must have large aperture to gather more light. It should also have large focal length

. Therefore, lens

is selected as objective lens. <br> The eye piece should have small aperture and small focal length. Therefore, lens

is selected as eye lens. In normal adjustment, Magnifying. <br> power,

<br>

Answer 2

You have been given four convex lenses of focal length 35 cm, 25 cm,

8 cm and 4 cm. Which two convex lenses will you select for designing a

compound microscope for maximum magnifying power and why ?​

Answer:

so with focal length =4cm

is most appropriate for making compound microscope

REASON

• magnification ∝ 1/ focal length

so having smallest focal length has highest magnification

hence we must use a compound microscope with highest magnification

HOPE THIS HELPS U DEAR