An object is placed 15cm in front of a plane mirror. If the mirror is moved further 5cm away from the object. How far is the image from the object
A. 80cm B. 40cm C. 50cm D. 70cm Correct Answer: Option B – 40cm
The instrument used to view stars is the?
A. Prism binoculars B. Telescope C. Film projector D. Microscope Correct Answer: Option B – Telescope
Which of the following statements is correct about a machine?
A. Efficiency of a machine is always greater than 1 B. Efficiency decreases with an increase in friction C. Velocity ratio depends on friction D. Mechanical advantage increases with an increase in friction Correct Answer: Option B – Efficiency decreases with an...If the distance between the object and the pinhole of a pinhole camera is reduced by half the size of the image of the object?
A. Is quadrupled B. Is halved C. Remains the same D. Is double Correct Answer: Option D – Is double
Myopic defects in the human eye can be corrected through the use of a?
A. Concave Mirror B. Concave lens C. Prism D. Convex lens Correct Answer: Option B – Concave lensProducts
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