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 11
A compound microscope consists of which two main lenses?
Describe the function of the diaphragm in a compound microscope.
Explain why a reflecting telescope is preferred over a refracting telescope for astronomical observations.
Name the defect of vision in which a person cannot see distant objects clearly, and state the type of lens used to correct it.
Name the optical instrument that is used to measure the angle of rotation of the plane of polarization of light.
State one main difference between a refracting telescope and a reflecting telescope.
A person with hypermetropia uses a lens of power +2.5 D. What is the focal length of the lens in meters?
In a laboratory, a student uses a microscope with an objective of magnification 40× and an eyepiece of magnification 10×. What is the total magnification?
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 lens (2) the focal length of the eyepiece (3) the color of the eyepiece (4) the length of the tube
Which of the following instruments is used to measure the refractive index of a liquid? (1) Microscope (2) Telescope (3) Spectrometer (4) Refractometer
Which of the following is NOT a defect of vision? (1) Myopia (2) Hypermetropia (3) Astigmatism (4) Chromatic aberration
A camera uses a ________ lens to focus light onto the film or sensor.
The least distance of distinct vision for a normal human eye is usually taken as ________ cm.
The magnifying power of a simple magnifier is maximum when the image is formed at the ________ point of the eye.
The minimum distance between two points that can be distinguished as separate by an optical instrument is called its ________.
True or False: A periscope uses only mirrors to change the direction of light.
True or False: In a compound microscope, the objective lens has a shorter focal length than the eyepiece.
True or False: The angular magnification of an astronomical telescope in normal adjustment is given by the ratio of the focal length of the objective to that of the eyepiece.
True or False: The resolving power of a microscope increases with decreasing wavelength of light used.
