Question

a convex lens of focal length 25 cm is placed at a distance X form a concave lens of focal length 7cm. when a parallel beam is incident on the convex lens. what is the value of x​?

Answer 1

Explanation:

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Answer 2

Given: focal length of concave lens = 25cm

           focal length of convex lens = 7cm

To find: distance between the concave and convex lens.

Solution:

Let the focal length of the concave lens be f₁,

the focal length of the convex lens is f₂.

Since the parallel beam is incident on the convex lens, so we can interpret the formula.

From the above equation, f₂ = x+ f₁

                                          x = f₂ - f₁

                                            = 25 - 7 = 18cm

Therefore, the value of x will be 18cm