Question

Sunlight goes through a lens and focuses on a screen 29.0 cm away. What is the focal length of the lens?

a) 29.0 cm
b) 14.5 cm
c) 58.0 cm
d) 5.8 cm

Answer 1

The focal length of the lens can be determined using the lens formula: 1/f = 1/v - 1/u, where f is the focal length of the lens, v is the distance between the lens and the screen, and u is the distance between the lens and the object.

Step-by-step explanation:

The focal length of the lens can be determined using the lens formula:

1/f = 1/v - 1/u

where f is the focal length of the lens, v is the distance between the lens and the screen (which is 29.0 cm), and u is the distance between the lens and the object (which is assumed to be very far away, so it can be considered as infinity).
Plugging in the given values, we get:

1. 1/f = 1/29.0 - 0
2. 1/f = 1/29.0
3. f = 29.0 cm

Therefore, the focal length of the lens is 29.0 cm (option a).