Home
Class 12
PHYSICS
What is the focal length of a convex len...

What is the focal length of a convex lens (`mu` = 1.5) with radii of curvature R.

Text Solution

Verified by Experts

From the lens maker's formula,
` 1/f = (mu -1) ((1)/(R_1) - (1)/(R_2))`
Here ` mu = 1.5 , R_1 = R " and " R_2 = - R`
` therefore 1/f = (1.5 - 1) ((1)/(R) - (1)/(-R)) = 0.5 xx 2/R = 1/R`
or ` f = R`
Promotional Banner

Similar Questions

Explore conceptually related problems

Radii of curvatures (R)

The focal length of the lens is ….

The focal length of an eqniconvex lens is equal to the radius of curvature of either face. What is the value of refractive index of the material same of the lens?

The focal length of a convex lens is 20 cm. What is the power?

What is the focal length of a convex lens of focal length 30 cm in contact with a concave lens of focal length 20 cm? is the system a converging or a diverging lens ? Ignore thickness of the lenses.

The focal length of a convex mirror is 20 cm, its radius of the curvature will be