A student wants to project the image of a candle flame on a screen 90 cm in front of a mirror by keeping the flame at a distance of 15 cm from its pole.
- Suggest the type of mirror he should use.
- Determine the linear magnification in this case.
- Find the distance between the object and its image.
- Draw ray diagram to show the image formation in this case.
CBSE OUTSIDE DELHI - SET 3 2014
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- Concave mirror.
- $\text{Linear magnification} = -\frac{\text{Image distance}}{\text{Object distance}}$
Object distance, u = -15 (u is always negative)
Image distance, v = -90 (-ve sign as the image is formed in front of the mirror on the screen)
$m = -\frac{(- 90)}{(-15)} \ \ \ \ \ \ \ \ \ \ \therefore m = -6$
- The distance between the object and its image is 75 cm.
- Ray diagram:
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