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प्रश्न
List some things that concave lens and concave mirror have in common.
उत्तर
Few things which are common to both a concave lens and a convex mirror are as follows:
- Both diverge a parallel beam of light.
- Both form a virtual image at all times.
- Both have a virtual focus.
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संबंधित प्रश्न
Explain with the help of a diagram, why the concave lens is also called a diverging lens.
Which type of lens is
a diverging lens? Explain your answer with diagrams.
When an object is placed 10 cm in front of lens A, the image is real, inverted, magnified and formed at a great distance. When the same object is placed 10 cm in front of lens B, the image formed is real, inverted and same size as the object.
What is the focal length of lens A?
The power of a concave lens is 10 D and that of a convex lens is 6 D. When these two lenses are placed in contact with each other, the power of their combination will be :
(a) +16 D
(b) +4 D
(c) −16 D
(d) −4 D
A person cannot see distant objects clearly. His vision can be corrected by using the spectacles containing:
(a) concave lenses
(b) plane lenses
(c) contact lenses
(d) convex lenses
A person finds difficulty in seeing nearby objects clearly. His vision can be corrected by using spectacles containing:
(a) converging lenses
(b) diverging lenses
(c) prismatic lenses
(d) chromatic lenses
Where will the image be formed if an object is kept in front of a concave lens at a distance equal to its focal length? Draw a ray diagram to illustrate your answer.
A concave lens, if kept at a proper distance from an object, can form its real image.
A student obtained clear image of window grills on the screen. But the teacher told him to get the image of a tree far away, instead of window. To get a clear image, the lens must be ............................
Define the principal focus of a concave lens.
