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Question
What type of lens is used to correct
myopia?
Solution
Concave lenses are used to correct myopia.
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RELATED QUESTIONS
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?
Only one of the following applies to a concave lens. This is:
(a) focal length is positive
(b) image distance can be positive or negative
(c) height of image can be positive or negative
(d) image distance is always negative
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.
Give two characteristic of the image formed by a concave lens.
State two applications of a concave lens.
Explain the working of an astronomical telescope using refraction of light.
A virtual diminished image is formed when an object is placed between the optical centre and the principal focus of a lens.
(i) Name the type of lens which forms the above image.
(ii) Draw a ray diagram to show the formation of the image with the above stated characteristics.
Draw images in case of a concave lens when the object is at infinity.
In a reading glass what is the position of the object with respect to the concave lens used?
A parallel, oblique beam of light falls on a concave lens. Draw a diagram to show refraction of light through the lens.
