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Physics ECAT Pre Engineering Chapter 9 Physical Optics
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Total Questions15
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Time Allowed20
Physics ECAT Pre Engineering Chapter 9 Physical Optics
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Question # 1
To observe interference of light, the condition, which must be met with is that the sources must be:
Question # 2
Wave length of light, on the average, is given by:
Question # 3
The image of an object 5 mm length is only 1 cm high. The magnification produced by lens is:
Question # 4
When the object lies between F and 2F, the image formed by is formed at:
Question # 5
Conventionally, all the distance p, q, f are measured from _____ of the lens:
Question # 6
In an interference pattern of Young's double slit(YDS) experiment:
Question # 7
The velocity of light in vacuum can be changed by changing
Question # 8
The magnifier forms a virtual image of the object at:
Question # 9
A convex lens acts as diverging lens when the object is placed:
Question # 10
If the focal length of the convex lens is 5 cm, then to get the real and inverted image of the same size as that of object, the object should be placed at:
Question # 11
The contrast in the fringes in an interference pattern depends upon
Question # 12
For the virtual image, option _______ is not correct:
Question # 13
A line which represents the direction of travel of a wave is known as:
Question # 14
A grating with high resolving power can distinguish _______ difference in wavelengths :
Question # 15
If the object and its image are located at a distance of 5 cm from the focus of a convex lens, the focus length of the lens will be:
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