DP Physics (last assessment 2024)
Question 17N.3.SL.TZ0.c.iv
| Date | November 2017 | Marks available | [Maximum mark: 2] | Reference code | 17N.3.SL.TZ0.c.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.c.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).
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
