Question

17. What will be the magnification of the lens, when an object is placed at a distance of
80 cm from a concave lens of focal length 30 cm?​

Answer 1

Answer:

i can say the answer of diffrent queion

Explanation:

the focal length of concave lens is 50 cm if an object is kept at the distance of 75 cm from the lens then find the image distance and magnification produced by the lens​We know that the focal length of a concave lens is always '-ve' and the image distance is also '-ve'

Here,

Focal length, f=-50cm

Image increases, u=-75cm

Now,

According to lens formula

So, the image distance is 30cm.

Again,

Magnification, m

Thus, the image is 0.4 times magnified.