Optical Instruments
Physics ⇒ Light and Optics
Optical Instruments starts at 10 and continues till grade 12.
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See sample questions for grade 10
A convex lens of focal length 20 cm is used as a magnifying glass. What is its power?
A person is using a simple microscope with a lens of focal length 5 cm. What is the maximum magnification possible if the least distance of distinct vision is 25 cm?
A person uses a magnifying glass of focal length 10 cm. What is the power of the lens?
A person with myopia uses a lens of power -2 diopters. What type of lens is it?
Describe the function of the eyepiece in a telescope.
Explain the role of the objective lens in a compound microscope.
Explain why a reflecting telescope is preferred over a refracting telescope for astronomical observations.
Explain why the image formed by a simple microscope is virtual.
Name the part of the human eye that controls the amount of light entering the eye.
Name the two main types of telescopes based on the principle they use to collect light.
State one difference between a simple microscope and a compound microscope.
State the principle of a periscope.
State the principle of working of an optical fiber.
What is the function of the diaphragm in a camera?
Which optical instrument is used by watchmakers to see small parts clearly?
Which optical instrument is used to correct hypermetropia (farsightedness)?
Which optical instrument is used to view objects that are not in the direct line of sight, such as in a submarine?
Which part of the human eye acts as a natural lens?
Which part of the human eye is responsible for focusing light onto the retina?
