A concave lens of focal length 15 cm forms an image 10 cm from the lens. How far is the object placed from the lens? Draw the ray diagram.

Asked by Vishal kumar | 1 year ago |  161

1 Answer

Solution :-

Focal length of concave lens (OF1), f = - 15 cm

Image distance, v= - 10 cm

According to the lens formula,

\( \frac{1}{v}-\frac{1}{u}=\frac{1}{f}\)

\( \frac{1}{u}=\frac{1}{v}-\frac{1}{f}=-\frac{1}{10}-\frac{1}{15}=\frac{1}{10}+\frac{1}{15}\)

The negative value of u indicates that the object is placed 30 cm in front of the lens. This is shown in the following ray diagram.

Answered by Shivani Kumari | 1 year ago

Related Questions

A doctor has prescribed a corrective lens of power +1.5 D. Find the focal length of the lens. Is the prescribed lens diverging or converging?

Class 10 Science Light Reflection and Refraction View Answer

An object of size 7.0 cm is placed at 27 cm in front of a concave mirror of focal length 18 cm. At what distance from the mirror should a screen be placed so that a sharply focused image can be obtained? Find the size and the nature of the image.

Class 10 Science Light Reflection and Refraction View Answer

An object 5 cm is placed at a distance of 20 cm in front of a convex mirror of radius of curvature 30 cm. Find the position, nature, and size of the image.

Class 10 Science Light Reflection and Refraction View Answer