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प्रश्न
State the position of object, position of image, nature of image when: Convex lens is used as objective lens of astronomical telescope.
उत्तर
Object is at infinity.
Image is formed at F2 on the other side of lens. Image is real; inverted and almost diminished to a point.
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संबंधित प्रश्न
Draw a ray diagram to show the formation of image in the above situation
Draw a labelled ray diagram to show how a ray of light passes through a parallel sided glass block:
if it hits the glass block at 90° (that is, perpendicular to the glass block)
In order to obtain a real image twice the size of the object with a convex lens of focal length 15 cm, the object distance should be:
(a) more than 5 cm but less than 10 cm
(b) more than 10 cm but less than 15 cm
(c) more than 15 cm but less than 30 cm
(d) more than 30 cm but less than 60 cm
Complete the following sentence.
A long-sighted person cannot see ........... objects clearly. Long-sightedness can be corrected by using .............. lenses.
The image obtained while finding the focal length of convex lens is ....................
State two applications of a convex lens.
A candle is placed between f and 2f a convex lens. Draw a ray diagram showing the position of the image.
Draw a ray diagram to illustrate the determination of the focal length of a convex lens using an auxiliary plane mirror.
Define the principal focus of a convex lens.
Distinguish between:
Concave lens and Convex Lens
