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Question 17N.3.SL.TZ0.9c.iv

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Date November 2017 Marks available [Maximum mark: 2] Reference code 17N.3.SL.TZ0.9c.iv
Level SL Paper 3 Time zone TZ0
Command term Explain, Identify Question number c.iv Adapted from N/A
c.iv.
[Maximum mark: 2]
17N.3.SL.TZ0.9c.iv

A magnifying glass is constructed from a thin converging lens.

The object is replaced with an L shape that is positioned 0.30 m vertically above the principal axis as shown. A screen is used to form a focused image of part of the L shape. Two points P and Q on the base of the L shape and R on its top, are indicated on the diagram. Point Q is 10.0 m away from the same lens as used in part (b).

(c.iv)

The screen is now correctly positioned to form a focused image of point R. However, the top of the L shape looks distorted. Identify and explain the reason for this distortion.

[2]

Markscheme

spherical aberration

top of the shape «R» is far from axis so no paraxial rays

For MP2 accept rays far from the centre converge at different points

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