Compound Microscope

Q. The two lenses of a compound microscope are a convex and a concave lens.

1. True
2. False

Q. Why is a simple microscope used while repairing watches?

Q.

A convex lens of focal length 15 cm is used as a magnifying glass.At what position from the lens should a textbook be placed to get a magnification of +2.00? (Assume lens to be at origin)

Q. In microscopes, which type of lenses are used?

1. Concave
2. Plane glass block
3. Convex
4. None

Q. The magnifying power of a simple microscope can be increased, if we use eye-piece of:

1. Higher focal length
2. Smaller diameter
3. Smaller focal length
4. Higher diameter

Q. Assertion: If objective and eye lenses of a microscope are interchanged then it can work as telescope.
Reason: The objective of telescope has small focal length.

1. Both assertion and reason are correct and reason is the correct explanation of the assertion
2. Both assertion and reason are correct, but reason is not the correct explanation of the assertion.
3. Assertion is correct, but reason is incorrect.
4. Assertion is incorrect, but reason is correct.
5. Both assertion and reason are incorrect.

Q.

What will the value of angular magnification be if the final image is formed at near point, instead of infinity?

1. $m=\left(\frac{L}{f_O}\right)(1+D/f_e)$

2. $m=\frac{LD}{f_O{f}_e}$

3. $m=\left(\frac{L}{f_e}\right)(1+D/f_O)$

4. $m=\frac{L}{f_O}$

Q. A microscope makes use of

1. convex lenses
2. no lenses at all
3. concave lenses
4. both convex and concave lenses

Q. Describe the displacement method to determine focal length of Convex Lens under the following headings:
(i) Ray diagram
(ii) Formula derivation
(iii) Why the distance between two pins should be greater than $4f$?

Q. Which of the following quantities increase when wavelength is increased? Consider only the magnitudes.

1. The power of converging lens.
2. The focal length of a converging lens.
3. The power of a diverging lens.
4. The focal length of a diverging lens.

Q. The whole class can do this experiment together. Take a piece of bread or roti. Sprinkle a few drop of water on it, and put in a box. Close the box. See the bread or roti everyday until you find some changes on it. Make this table on a chart paper and put it up in the classroom. Fill up the chart every day after discussing the changes seen.

Q. In the given diagram label $A,B,C$ and $D$ and give the function of $B$ and $D$.