Question

)A combination of lenses for a camera contains two converging lenses of focal length 20cm

and 40 cm and a diverging lens of focal length 15 cm. Find the power and focal length of the combination.

plzzzz tell me​

Answer 1

Answer:

hey mate, i hope this pic i attached will be clear.

we will use here the concept of total focal length of a combination of lens and then use power formula for combination of lens. thanks!