Question

# A bulb is located on a wall. Its image is to be obtained on a parallel wall with the help of convex lens. If the distance between parallel walls and lens is $$'d'$$ then, required focal length of lens placed in between the walls is:

A
Only d4
B
Only d2
C
More than d4 but less than d2
D
Less than or equal to d4

Solution

## The correct option is B Only $$\dfrac{d}{2}$$R.E.F image A real image is to be formed on the $$2^{nd}$$ all of the bulb placed on the first wall by the convex lens. The lens is placed at a distance of d from the $$2^{nd}$$ wall Now, we know that to form a real image of an object on a screen by a convex lens,the distance between the source and the screen (D) should be equal to 4f, where f is the focal length of the lens.in that caus, $$u = v = D/2 = d$$$$f = D/4 = d/2$$ Physics

Suggest Corrections

0

Similar questions
View More

People also searched for
View More