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प्रश्न
A concave mirror and convex lens are held in water. What changes, if any, do you expect in their focal length?
उत्तर
The focal lengths of a mirror does not depend upon the nature of the medium in which it is placed whereas the focal length of a lens depends upon the medium in which it is placed. Thus there will be no change in the focal length of the concave mirror whereas the focal length of the convex lens will change.
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संबंधित प्रश्न
An object 5 cm in length is held 25 cm away from a converging lens of focal length 10 cm. Draw the ray diagram and find the position, size and the nature of the image formed.
Which of the above two cases illustrates the working of a magnifying glass?
What kind of lens can form:
an erect magnified image?
An object is placed 20 cm from (a) a converging lens, and (b) a diverging lens, of focal length 15 cm. Calculate the image position and magnification in each case.
Which part causes the greatest convergence?
Draw a diagram to represent the second focus of a convex lens.
Observe the following figure and complete the table:
| Points | Answer |
| (i) Position of the object | |
| (ii) Position of the image | |
| (iii) Size of the image | |
| (iv) Nature of the image |
Which of the following statements is true?
Distinguish between Concave lens and Convex lens.
Distinguish between:
Concave lens and Convex lens
