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 12
A compound microscope is adjusted so that the final image is formed at infinity. What is the magnifying power in terms of the focal lengths of the objective (fo) and eyepiece (fe)?
Describe the principle of a spectrometer.
Describe the working principle of a periscope.
Explain the difference between a refracting and a reflecting telescope.
Explain why astronomical telescopes use large objective lenses or mirrors.
In a laboratory, a student uses a spectrometer to measure the angle of minimum deviation for a prism. What property of the prism can be determined from this measurement?
A student observes that the image through a compound microscope is blurry at the edges but sharp at the center. Which optical aberration is most likely responsible for this effect?
In a laboratory experiment, a student uses a spectrometer to measure the angle of deviation for various wavelengths passing through a prism. Explain how this data can be used to determine the dispersive power of the prism material.
A person with myopia uses which type of lens to correct their vision? (1) Convex lens (2) Concave lens (3) Cylindrical lens (4) Plano-convex lens
The image formed by the objective lens in a compound microscope is (1) real and inverted (2) virtual and erect (3) real and erect (4) virtual and inverted
The resolving power of a telescope depends on (1) the diameter of the objective (2) the focal length of the eyepiece (3) the length of the tube (4) the color of the telescope
Which of the following instruments is used to measure the refractive index of liquids? (1) Spectrometer (2) Microscope (3) Telescope (4) Periscope
A simple magnifier uses a ______ lens to produce a virtual, erect, and magnified image of an object.
The minimum distance at which the eye can see objects clearly is called the ______ distance.
The near point of a normal human eye is at a distance of ______ cm from the eye.
The power of accommodation of the human eye refers to its ability to adjust the ______ to focus on objects at different distances.
A person with astigmatism uses cylindrical lenses for correction. True or False?
A person with hypermetropia cannot see nearby objects clearly. True or False?
The angular magnification of a simple magnifier is maximum when the final image is formed at the least distance of distinct vision. True or False?
The resolving power of a microscope increases if the wavelength of light used is decreased. True or False?
