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One half of a convex lens of focal length 10 cm is covered with a black paper. Can such a lens produce an image of a complete object placed at a distance of 30 cm from the lens? Draw a ray diagram to justify your answer. A 4 cm tall object is placed perpendicular to its principal axis of a convex lens of focal length 20 cm. The distance of the object from the lens is 15 cm. Find the nature, position and the size of the image.
Explain the following term related to spherical lenses:- centres of curvature
An image formed by a ______ mirror is always of the same size as that of the object.
Complete the following diagrams in Figure by drawing the reflected rays for the incident rays 1 and 2.
An object forms a virtual image which is 1/8th of the size of the object. If the object is placed at a distance of 40 cm from the convex mirror, calculate:
- the position of the image
- the focal length of the convex mirror.
Define the following term in relation to concave mirror.
Radius of curvature
Define the term principal focus in case of convex mirror. Draw a convex mirror and show its principal focus and focal length clearly.
Define linear magnification produced by a mirror?
The spherical mirror used as a rear view mirror in the vehicle is
The minimum length of the mirror required to see the full image of the person is half ‘ of his height.
