A concave mirror and a convex lens are held i | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(C) The focal length of a mirror depends only on its radius of curvature $(f = R/2)$ and is independent of the surrounding medium.Therefore, the focal

Vedclass · Accepted Answer

Focal length of the mirror will remain the same, while the focal length of the lens will increase.

Vedclass · Answer

(C) The focal length of a mirror depends only on its radius of curvature $(f = R/2)$ and is independent of the surrounding medium.Therefore, the focal length of the concave mirror remains unchanged when placed in water.However, the focal length of a lens is determined by the Lens Maker's Formula: $1/f = (n_g/n_m - 1)(1/R_1 - 1/R_2)$, where $n_g$ is the refractive index of the lens material and $n_m$ is the refractive index of the medium.Since the refractive index of water $(n_m \approx 1.33)$ is greater than that of air $(n_m \approx 1.0)$, the term $(n_g/n_m - 1)$ decreases, causing the focal length $(f)$ of the convex lens to increase.

$A$ concave mirror and a convex lens are held in water. What changes, if any, do you expect in their focal length?

Similar Questions

$A$ concave mirror and a convex lens are held in water. What changes, if any, do you expect in their focal length?

The nature,size,and position of the image of an object produced by a lens or mirror are as shown below. Identify the lens/mirror $(X)$ used in each case and draw the corresponding complete ray diagram.

Under which of the following conditions can a concave mirror form an image larger than the actual object?

Vedclass Test Series

Exam Paper Generator

Online Exam Module