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प्रश्न
Find the odd one out and give its explanation.
पर्याय
Simple microscope
Compound microscope
Telescope
Prism
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उत्तर
Prism
Explanation-
Prism disperses light while other optical instruments produce magnified images of objects.
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संबंधित प्रश्न
An object is placed at a distance of 15 cm from a convex lens of focal length 20 cm. List four characteristics (nature, position, etc.) of the image formed by the lens.
Where should an object be placed in front of a convex lens so as to obtain its real, inverted and magnified image?
Fill in the following blank with suitable word:
Parallel rays of light are refracted by a convex lens to a point called the ........
Distinguish between a convex lens and concave lens. Which of the two is a converging lens : convex lens of concave lens?
Describe with the help of a ray-diagram, the formation of image of a finite object placed in front of convex lens between f and 2f. Give two characteristics of the image so formed.
List some things that convex lens and concave mirror have in common.
What type of images can a convex lens make?
A beam of parallel light rays is incident through the holes on one side of a box and emerges out through the holes on its opposite side as shown in the diagram below:
Which of the following could be inside the box?
(a) a rectangular glass block
(b) a concave lens
(c) a convex lens
(d) a glass prism
What kind of lens can form:
an inverted magnified image?
What kind of lens can form:
am erect diminished image?
Complete the following sentence.
A long-sighted person cannot see ........... objects clearly. Long-sightedness can be corrected by using .............. lenses.
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 | –60 | +12 |
| 2 | –30 | +15 |
| 3 | –20 | +20 |
| 4 | –15 | +30 |
| 5 | –12 | +60 |
| 6 | –9 | +90 |
(a) What is the focal length of the convex lens? State reason for your answer.
(b) For what object-distance (u) is the corresponding image-distance (v) not correct? How did you arrive at this conclusion?
(c) Choose an appropriate scale to draw a ray diagram for the observation at S. No. 4 and find the approximate value of magnification.
Distinguish between:
Concave lens and Convex lens
If an object is placed in front of a convex lens beyond 2F1, then what will be the position, relative size, and nature of an image which is formed? Explain with a ray diagram.
What is the difference between a double convex and a bi-convex lens?
Out of the two lenses one concave and the other convex state which is a convergent or a divergent type of a lens. Give a reason for your answer.
Can a normal convex lens behave like a concave lens and vice-versa?
Write the name.
The lens used in simple microscope.
Distinguish between:
Concave lens and Convex Lens
