Question
How many images of an object placed in between two mirrors is produced when the angle between the mirrors is 90 degrees?
- 1
- 2
- 3
- 4
Hint:
3 images of an object placed in between two mirrors is produced when the angle between the mirrors is 90 degrees
The correct answer is: 3
- When an object is sandwiched between two plane mirrors at an angle of 90°, there are three images.
- The two mirrors, held perpendicular to each other, are known to produce three images of him for an object placed between them.
- That is, the angle between the two mirrors is 60°, n=360°/90° = 4, number of images = n-1 = 4-1 = 3.
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What should a person do when dust enters their eyes?
The correct option is c)Wash your eyes using clean water.
Slight temporary visual impairment may occur. Once the dust is removed, the swelling and irritation of the eye is reduced and vision returns to normal. However, there is a possibility of infection due to bacteria contained in dust. Therefore we should immediately wash your eyes with cold water.
What should a person do when dust enters their eyes?
The correct option is c)Wash your eyes using clean water.
Slight temporary visual impairment may occur. Once the dust is removed, the swelling and irritation of the eye is reduced and vision returns to normal. However, there is a possibility of infection due to bacteria contained in dust. Therefore we should immediately wash your eyes with cold water.