Question

A. The mirror has a focal length of -6 cm and will produce an image of magnification +1.

B. The mirror has a focal length of -3 cm and will produce an image of magnification -1.

C. The mirror has a focal length of -3 cm and will produce an image of magnification +1.

D. The mirror has a focal length of -6 cm and will produce an image of magnification -1.

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Answer 1

Answer:

B

Step-by-step explanation:

A. The mirror has a focal length of -6 cm and will produce an image of magnification +1.

B. The mirror has a focal length of -3 cm and will produce an image of magnification -1.

C. The mirror has a focal length of -3 cm and will produce an image of magnification +1.

D. The mirror has a focal length of -6 cm and will produce an image of magnification -1.

according to options given above the crct answer is :B

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Answer 2

B)The mirror has a focal length of -3 cm and will produce an image of magnification -1.

• It is a concave mirror, the focus will have a negative sign as the point at will parallel light rays will meet after reflection will be at the left of the mirror.

• The object is at centre of curvature. The size of image and the size of object will be same the magnitude of magnification will be 1. As the image is inverted there will be a negative sign with the magnification as well.

Magnification  = $\frac{h_{image} }{h_{object} }$ = -1

Therefore, the focal length will be -3cm and the magnification will be 1.