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Question
What type of image is formed:
on a cinema screen?
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Solution
The image formed on a cinema screen is real because it is formed due to an actual meeting of the light rays.
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RELATED QUESTIONS
Match the items given in Column I with one or more items of Column II.
| Column I | Column II | ||
| (a) | A plane mirror | (i) | Used as a magnifying glass. |
| (b) | A convex mirror | (ii) | Can form image of objects spread over a large area. |
| (c) | A convex lens | (iii) | Used by dentists to see enlarged image of teeth. |
| (d) | A concave mirror | (iv) | The image is always inverted and magnified. |
| (e) | A concave lens | (v) | The image is erect and of the same size as the object. |
| (vi) | The image is erect and smaller in size than the object. |
A 50 cm tall object is at a very large distance from a diverging lens. A virtual, erect and diminished image of the object is formed at a distance of 20 cm in front of the lens. How much is the focal length of the lens?
A small object is placed 150 mm away from a diverging lens of focal length 100 mm.
(i) Copy the figure below and draw rays to show how an image is formed by the lens.
Figure
(ii) Calculate the distance of the image from the lens by using the lens formula.
Write true or false
A virtual image formed by a spherical mirror is always erect and situated behind the mirror.
What is a spherical mirror?
Three mirrors are created from a single sphere. Which of the following - pole, centre of curvature, radius of curvature, principal axis - will be common to them and which will not be common?
What is a spherical mirror?
Define the terms focus and focal length of a concave mirror. Draw diagram to illustrate your answer.
The diagram below in Figure, shows a convex mirror. C is its centre of curvature and F is its focus. (i) Draw two rays from A and hence locate the position of image of object OA. Label the image IB. (ii) State three characteristics of the image.
Discuss the position and nature of image formed by a convex mirror when an object is moved from infinity towards the pole of mirror.
A real and enlarged image can be obtained by using a
The erect image formed by a concave mirror is of size double the size of object. How are u and v related?
When an object of height 1 cm is kept at a distance 4 cm from a concave mirror, its erect image of height 1.5 cm is formed at a distance 6 cm behind the mirror. Find the focal length of mirror, by drawing.
An object forms a virtual image which is 1/8th of the size of the object. If the object is placed at a distance of 40 cm from the convex mirror, calculate:
- the position of the image
- the focal length of the convex mirror.
The following figure shows a concave mirror with its pole (P), focus (F), and center of curvature (C). Draw a ray diagram to show the formation of the image of an object AB by the concave mirror.
A concave mirror can be used to produce a parallel beam of light. Draw a ray to illustrate this.
Which of the following has curved reflecting surface?
The distance from the pole to the focus is called ______.
The distance from the center of curvature of the mirror to the pole is called the focal length of the mirror.
