Part of an instrument consists a piece of glass and a mirror, as shown in the fi

Question

Part of an instrument consists a piece of glass and a mirror, as shown in the figure. Assume that the radius of the curve is r=25.0 cm and the index of refraction of glass isn=1.50. If it is treated as a diverging mirror/lens for paraxial rays, what is its focal length?

answer is in cm

Part of an instrument consists a piece of glass and a mirror, as shown in the figure. Assume that the radius of the curve is r=25.0 cm and the index of refraction of glass isn=1.50. If it is treated as a diverging mirror/lens for paraxial rays, what is its focal length? answer is in cm

Explanation / Answer

From the lens makers formula

1/ f = ( n - 1 ) ( 1/ R1 - 1/ R2 )

= ( 1.50 - 1 ) ( 1/ 25 cm )

f = 50 cm

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