HARD
12th West Bengal Board
IMPORTANT
Earn 100

Assertion: Normal eye cannot see objects clearly which are situated less than 25 cm away from the eye.

Reason: The distance of the retina from the eye lens is less than 25 cm.

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Important Questions on Human Eye and Optical Instruments

HARD
12th West Bengal Board
IMPORTANT

Assertion: The single lens of a simple microscope sometimes produces coloured image of a white object.

Reason: Single-lens always suffer from chromatic aberration.

HARD
12th West Bengal Board
IMPORTANT

Assertion: Street lamp-posts appear to be shorter the farther they are, although, they are all the same height.

Reason: The angle subtended at the eye by far-away posts are shorter.

HARD
12th West Bengal Board
IMPORTANT

Assertion: The magnification of a simple microscope m=Df.

Reason: Magnification=1+Df.

MEDIUM
12th West Bengal Board
IMPORTANT

Assertion: The magnification of the compound microscope is negative.

Reason: The final image in the compound microscope is inverted with respect to the object.