An object is placed at a distance of 15 cm. from a convex lens of focal length 20 cm. List four characteristics (nature, position, etc.) of the image formed by the lens.
CBSE OUTSIDE DELHI - SET 2 2017
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If an object is placed at a distance of 15cm from a convex lens of focal length 20cm, the image formed by the lens will have following characteristics.
The image will be virtual and erect.
It will be a magnified image; this means that the size of the image will be larger than the size of the object.
The position of the image will be at the same side where the object is placed.
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You are provided with two lenses of focal lengths 10cm and 20cm. Which of the two lenses would you suggest to obtain greater convergence on refracted light? Justify your choice.
AB and CD, two spherical mirrors, form parts of a hollow spherical ball with its centre at O as shown in the diagram. If arc $\text{AB}=\frac{1}{2}$ arc CD, what is the ratio of their focal lengths? State which of the two mirrors will always form virtual image of an object placed in front of it and why.