Adaptive Practice
Ray Optics and Optical Instruments
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Question 1 of 10
⏱ 0:30
Easy
What is the focal length of a concave mirror if the radius of curvature is 20 cm?
Medium
A convex lens forms a real, inverted image of an object placed at 30 cm from the lens. If the focal length of the lens is 20 cm, what is the image distance?
Easy
In a microscope, the total magnification is 120. If the magnification produced by the objective lens is 20, what is the magnification produced by the eyepiece?
Easy
Which of the following optical instruments uses two convex lenses to produce a magnified image of a distant object?
Medium
A ray of light passes from air into glass of refractive index 1.5 at an angle of incidence 30°. What is the angle of refraction?
Easy
The power of a spectacle lens is -2 diopters. What type of lens is it and what is its focal length?
Hard
In a compound microscope, if the focal length of the objective is 2 cm and that of the eyepiece is 5 cm, what is the total magnification if the tube length is 16 cm and the least distance of distinct vision is 25 cm?
Hard
A ray of light passes through a glass slab of thickness 5 cm and refractive index 1.5. What is the lateral displacement if the angle of incidence is 45°?
Easy
Which of the following statements is true for the image formed by a concave lens?
Medium
In a telescope, the angular magnification is 15. If the focal length of the objective lens is 75 cm, what is the focal length of the eyepiece?