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Solution - 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. - CBSE Class 10 - Science

ConceptRefraction of Light Image Formation in Lenses Using Ray Diagrams - Concave Lens

Question

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.

Solution

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

Image distance, v= – 10 cm
According to the lens formula,

`1/v-1/u=1/f`

`1/u=1/v-1/f`

`=-1/10-1/-15=-1/10+1/15=-5/150`

`u=-30 cm`

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.

Is there an error in this question or solution?

APPEARS IN

NCERT Science Textbook for Class 10
Chapter 10: Light - Reflection and Refraction
Q: 11 | Page no. 186

Reference Material

Solution for question: 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. concept: Refraction of Light - Image Formation in Lenses Using Ray Diagrams - Concave Lens. For the course CBSE
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