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Question
Find the odd one out and give its explanation.
Options
Simple microscope
Compound microscope
Telescope
Prism
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Solution
Prism
Explanation-
Prism disperses light while other optical instruments produce magnified images of objects.
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RELATED QUESTIONS
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 | –100 | +25 |
| 2 | –60 | +30 |
| 3 | –40 | +40 |
| 4 | –30 | +60 |
| 5 | –25 | +100 |
| 6 | –15 | +120 |
(a) What is the focal length of the convex lens? Give reason to justify your answer.
(b) Write the serial number of the observation which is not correct. On what basis have you arrived at this conclusion?
(c) Select an appropriate scale and draw a ray diagram for the observation at S.No. 2. Also find the approximate value of magnification.
A ray of light travelling in air is incident on a parallel-sided glass slab (or rectangular glass slab). Draw a ray-diagram indicating the change in its path in glass.
The diagram given alongside shows a ray of light entering a rectangular block of glass.
(a) Copy the diagram and draw the normal at the point of entry.
(b) Draw the approximate path of the ray of light through the glass block and out of the other side.
If an object is at a considerable distance (or infinity) in front of a convex lens, where is the image formed?
Fill in the following blank with suitable word:
Parallel rays of light are refracted by a convex lens to a point called the ........
Draw a ray diagram to show the formation of a real magnified image by a convex lens. (In your sketch the position of object and image with respect to the principal focus of lens should be shown clearly).
You eye contains a convex lens. Why is it unwise to look at the sun?
A convex lens of focal length 6 cm is held 4 cm from a newspaper which has print 0.5 cm high. By calculation, determine the size and nature of the image produced.
A student did an experiment with a convex lens. He put an object at different distances 25 cm, 30 cm, 40 cm, 60 cm and 120 cm from the lens. In each case he measured the distance of the image from the lens. His results were 100 cm, 24 cm, 60 cm, 30 cm and 40 cm, respectively. Unfortunately his results are written in wrong order.
Which of the object distances gives the biggest image?
Which type of lenses are:
thicker in the middle than at the edges?
Study the diagram given below.
- Name the lens LL’.
- What are the points O and O’ called?
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- Name a device in which this action of lens is used.
In the following cases, where must an object be placed in front of a convex lens so that the image formed is inverted and enlarged?
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State the position of object, position of image, nature of image when: Convex lens is used as objective lens of photographic camera.
Write the name.
The lens used in simple microscope.
- In which type of microscope do you find the lens arrangement as shown in the following diagram?
- Write about the working and the use of this microscope.
Distinguish between Concave lens and Convex Lens.
Distinguish between:
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