# Optics and Magnification on Objects

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Please help with 48, 56, 62, 72, 86 ONLY

48) What is the magnification of the object when the object is 35 cm from the lens (see attachment please)

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#### Solution Preview

Please see attached file

Practice questions

Do 48, 56, 62, 72, 86 ONLY

The lens equation is given as:

, where p = object distance, q = image distance

From the graph, at p = 10 cm, M = 0.6 (approx)

Therefore, 0.6 = -q/10, which gives q = -6 cm

Therefore,

Therefore, f = -15 cm.

Now, at p = 35 cm,

, therefore, q = -21/2 = -10.5 cm

Hence M = -q/p = 10.5/35 = 0.3. ...

#### Solution Summary

The optics and magnifications on objects are examined.

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