Question

1
01 A convex lens forms a News
point size image of an object at
infinity at a distance of 10 cm
from the lens. Power of lens in
Dioptre is​

Answer 1

Explanation:

focal length = 10cm

power = 100/10 = 10 D

Answer 2

Answer:

Given:u=−10cm f=20cm (convex lens)

To find: v and image's nature.

Solution: From lens formula

v

1

−

u

1

=

f

1

v

1

+

10

1

=

20

1

v

1

=

20

−1

v=−20cm

And magnification =

u

v

=2

Hence image formed is virtual, erect and magnified two times.

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