A student uses a lens of focal length -50 cm. What is the nature of the lens and its power?

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Solution

Dear Student

The first point to remember is the sign convention. The sign assigned to concave lens is negative.

Now in the given question , f = -50cm
= -(50/100)m
=-1/2m =-0.5 m
Power = 1/f
Hence power = -1/( 0.5) or -2D
= -2D is the required answer.

Regards

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A student uses a lens of focal length -50 cm. What is the nature of the lens and its power?

Dear Student The first point to remember is the sign convention. The sign assigned to concave lens is negative. Now in the given question , f = -50cm = -(50/100)m =-1/2m =-0.5 m Power = 1/f Hence power = -1/( 0.5) or -2D = -2D is the required answer. Regards

Dear Student

The first point to remember is the sign convention. The sign assigned to concave lens is negative.

Now in the given question , f = -50cm
= -(50/100)m
=-1/2m =-0.5 m
Power = 1/f
Hence power = -1/( 0.5) or -2D
= -2D is the required answer.

Regards