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Suppose a lens is made from fused quartz (glass), and that

Chapter 26, Problem 127PP

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QUESTION:

Problem 127PP

Suppose a lens is made from fused quartz (glass), and that its focal length in air is −7.75 cm. What is the focal length of this lens if it is immersed in benzene? (Refer to Table.)

A. –130 cm

B. 134 cm

C. 141 cm

D. −145 cm

Questions & Answers

QUESTION:

Problem 127PP

Suppose a lens is made from fused quartz (glass), and that its focal length in air is −7.75 cm. What is the focal length of this lens if it is immersed in benzene? (Refer to Table.)

A. –130 cm

B. 134 cm

C. 141 cm

D. −145 cm

ANSWER:

Step 1 of 2

Here we need to find the focal length of the given lens when it is immersed in benzene. The given lens is having a focal length in air as  and is made of fused quartz (glass).

Given data,

Focal length of lens in air,

From Table 26-2, we have

Refractive index of glass or lens,

Refractive index of benzene fluid,

To find,

Focal length of lens in benzene fluid,

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