MEDIUM
12th West Bengal Board
IMPORTANT
Earn 100
Write W for the incorrect statements and R for the correct ones:
Concave lenses are used to remedy long-sight defect and convex lens for short- sight defect.
50% studentsanswered this correctly
Important Questions on Human Eye and Optical Instruments
HARD
12th West Bengal Board
IMPORTANT
Write W for the incorrect statements and R for the correct ones:
The focal length of the eyepiece of an astronomical telescope is longer than that of the objective.
HARD
12th West Bengal Board
IMPORTANT
Write W for the incorrect statements and R for the correct ones:
Galilean telescopes are used in binoculars because they form erect images.
HARD
12th West Bengal Board
IMPORTANT
Write W for the incorrect statements and R for the correct ones:
The length of the image of an object formed by the eye is proportional to the visual angle subtended at the eye by the object.
MEDIUM
12th West Bengal Board
IMPORTANT
To remove short sight or myopia, the spectacle lens should be_____
HARD
12th West Bengal Board
IMPORTANT
The image formed on the retina of an eye is and _____ (real and inverted\ virtual and erect\virtual and inverted\real and erect)
EASY
12th West Bengal Board
IMPORTANT
The least distance of distinct vision for a normal eye is about _____
HARD
12th West Bengal Board
IMPORTANT
The tube length of an astronomical telescope is _____ than that of a Galilean telescope.
HARD
12th West Bengal Board
IMPORTANT
The final image in an astronomical telescope with respect to the object is virtual but that in Galilean telescope the image is _____
