Advertisements
Advertisements
प्रश्न
A .............. mirror is obtained on silvering the outer surface of a part of a hollow glass sphere.
Advertisements
उत्तर
A concave mirror is obtained on silvering the outer surface of a part of a hollow glass sphere.
APPEARS IN
संबंधित प्रश्न
Analyse the following observation table showing variation of image distance (v) with object distance (u) in case of a convex lens and answer the questions that follow, without doing any calculations:
| S. No. | Object distance u(cm) | Image distance v(cm) |
| 1 | −90 | +18 |
| 2 | −60 | +20 |
| 3 | −30 | +30 |
| 4 | −20 | +60 |
| 5 | −18 | +90 |
| 6 | −10 | +100 |
(a) What is the focal length of the convex lens? Give reason in support of your answer.
(b) Write the serial number of that observation which is not correct. How did you arrive at this conclusion?
(c) Take an appropriate scale to draw ray diagram for the observation at S. No. 4 and find the approximate value of magnification.
Find the nature and focal length of a spherical mirror whose radius of curvature is +24 cm.
If the image formed by a spherical mirror for all positions of the object placed in front of it is always erect and diminished, what type of mirror is it? Draw a labelled ray diagram to support your answer.
Explain with a suitable diagram, how a concave mirror converges a parallel beam of light rays. Mark clearly the pole, focus and centre of curvature of concave mirror in this diagram.
What is the nature of a mirror having a focal length of, +10 cm?
What type of image/images are formed by:
a concave mirror?
State whether the following statement is true or false:
A diverging mirror is used as a rear-view mirror.
A ray of light of going towards the focus of a convex mirror becomes parallel to the principal axis after reflection from the mirror. Draw a labelled diagram to represent this situation.
A 5 cm tall object is placed perpendicular to the principle axis of a convex lens of focal length 12 cm. The distance of the object from the lens is 8 cm. Using the lens formula, find the position, size and nature of the image formed.
Why a convex mirror is preferred for rearview mirrors in cars?
