Question

image formed.
A concave lens of focal length 15 cm forms an image 10 cm from the lens. How far
is the object placed from the lens? Draw the ray diagram.
from a convex mirror of focal length
is
ce of 10 cm​

Answer 1

Answer:

the lens formula is 1/v-1/u=1/f

hence 1/10-1/u=1/15

-1/u=1/15-1/10

1/u=1/10-1/15

1/u=3-2/30

1/u=1/30

u=30

therefore the object is 30 cm away.

diagram is very important and easy so you should try it yourself

Answer 2

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Hope it Helps !!