Ans. A compound microscope consists of two convex lenses coaxially separated by some distance. The lens nearer to the object is called the objective. The lens through which the final image is viewed is called the eyepiece. The focal length of objective lens is smaller than eyepiece

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An object of size 3.0 cm is placed 14cm in front of a concave lens of focal length 21cm. Describe the image produced by the lens. What happens if the object is moved further away from the lens?

A compound microscope is usually also referred to as a Biological Microscope. The parts of a Compound Microscope include:

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Difference between simple and compound microscopes lies in the fact that compound microscopes have a much stronger magnifying capacity and are used in intense research. Some of the other microscopes are the stereo, inverted, metallurgical and polarising microscopes.

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Ques. A compound microscope uses an objective lens of focal length 4 cm and eyepiece lens of focal length 10 cm. An object is placed at 6 cm from the objective lens. Calculate the magnifying power of the compound microscope. Also calculate the length of the microscope. (CBSE 2011)(3 marks)

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Ques. Draw a labelled ray diagram of a compound microscope. Why are the objective and the eye-piece chosen to have a small focal length? (CBSE 2013)(2 marks)

Ans. Firstly, the object gives a magnified image of the object and after that the eyepiece produces the angular magnification.

Simple Microscope is used at a very basic level, where there is no meticulous requirement for research. It comprises a single lens. It is an instrument that gives a large image of a minute object. It produces an erect virtual image of the object. It has a double convex lens with a short focal length.

In a parallel plate capacitor with air between the plates, each plate has an area of 6 × 10–3 m2 and the distance between the plates is 3 mm. Calculate the capacitance of the capacitor. If this capacitor is connected to a 100 V supply, what is the charge on each plate of the capacitor?

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Ans. Epi-Fluorescence, stereo microscopes, Phase contrast microscope, Polarizing, Reflected light Metallurgical, Differential Interference microscope, and Brightfield Transmitted Microscope.

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The purpose of a compound microscope is similar to a simple microscope. It uses multiple lenses to magnify real-world objects that are microscopic to the naked eye. It is used for professional purposes where intense research is required. It comprises a plane mirror surface on one side and a concave mirror surface on the other side. Compound microscopes have multiple lenses.

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Ques. How does the power of a convex lens vary, if the incident red light is replaced by violet light? (Delhi 2008)(2 marks)

Ans. Definition of resolving power: Resolving power of compound microscope is defined as the reciprocal of the smallest distance between two point objects at which they can be just resolved when seen through microscope.

Ques. Why must both the objective and the eyepiece of a compound microscope have short focal lengths? (CBSE 2017)(2 marks)

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Ans. For getting higher magnification in compound microscope, both objective and eyepiece must have short focal length, because

Ques. Define the magnifying power of a compound microscope when the final image is formed at infinity. Why must both the objective and the eyepiece of a compound microscope have short focal lengths? Explain. (CBSE 2016)(2 marks)

Ans. Magnifying power of a compound microscope is defined as “the angle subtended at the eye by the image to the angle subtended (at the unaided eye) by the object”.

Ques. You are given two converging lenses of focal lengths 1.25 cm and 5 cm to design a compound microscope. If it is desired to have a magnification of 30, find out the separation between the objective and the eyepiece. (CBSE 2014)(3 marks)