a-science-instructor-holds-her-phone-2-0-m-away-from-a-whiteboard-the-teacher-wa

Question

A science instructor holds her phone 2.0 m away from a whiteboard. The teacher wants to magnify the device's screen three times using a lens. Determine the focal length and distance at which the lens should be positioned (with respect to the phone) to obtain this effect.

Accepted Answer

The lens should be 50 cm from the phone and have a focal length of 38 cm.

Answer

The lens should be 50 cm from the phone and have a focal length of 72 cm.

Answer

The lens should be 100 cm from the phone and have a focal length of 38 cm.

Answer

The lens should be 100 cm from the phone and have a focal length of 72 cm.

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A science instructor holds her phone 2.0 m away from a whiteboard. The teacher wants to magnify the device's screen three times using a lens. Determine the focal length and distance at which the lens should be positioned (with respect to the phone) to obtain this effect.