Question

For a convex lens object is placed at a distance 7.5cm,its image is found at 10 cm from the lens. The focal length of lens will be ?​

Answer 1

Explanation:

Given:u=-7.5cm, v=10cm, f=?

formula of lens =1/v-1/u=1/f

1/10-(-1/7.5)=1/10+1/7.5

=7.5+10/75=17.5/75

=175/750

f,=750/175=4.28cm.

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Answer 2

Answer:

answer attached in photo