Physics
Grade-10
Easy
Question
The image of an object located at a distance of 20 cm towards the left of a concave lens is formed at a distance of 60 cm towards the right of the lens. The magnification produced by the lens is ____.
- -3
- 3
- 2
- -2
Hint:
Since Image formed by concave lens is always diminished and upright, value of magnification will be negative.
The correct answer is: -3
For the image of an object located at a distance of 20 cm towards the left of a concave lens is formed at a distance of 60 cm towards the right of lens, the magnification produced by the lens is -3.
- The magnification in a concave lens can be calculated by m= -v/u
- The v is the distance of the image and u is the distance of the object.
- Given, v is 60cm and u is 20 cm, hence magnification m= -60/20= -3.
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