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Physics
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Solve the following crossword with the help of the given clues:
Across
(1) A microscope consisting two convex lenses
(3) The jelly-like substances that fills the area of the eyeball between the retina and the lens.
(5) A lens mounted in a frame used to make an object appear layer than it really is
(7) The organ of the body with which humans are able to see
(9) The clear, watery fluid that fills the chamber of the eye between the cornea and the lens.
(11) An optical instrument used to view distant objects. It makes far away objects appear larger when viewed through it.
(12) Defect of human eye, by virtue of which a person can see clearly the distant objects but we the nearby objects.
Down
(1) The front transparent part of the eye that is bulged outwards. Light from objects enter the eye through it.
(2) An optical device consisting of a conve lens of small focal length that is used to make things.
(4) An apparatus for taking photographs.
(6) The flat-coloured membrane in the lens that contacts the size of the pupil
(8) The opening in the centre of the iris through wheels light enters the eye.
(10) The defect of human eye due to which a person is able to near objects at close range better than distant objects.
284398_3ba4ea7c89b84fa99778a59456171be9.png

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Solution
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Across
(1) Compound microscope.
(3) Vitreous humour.
(5) Magnifying glass.
(7) Human eye.
(9) Aqueous humour.
(11) Telescope.
(12) Hypermetropia.
Down
(1) Cornea.
(2) Simple microscope.
(4) Camera.
(6) IRIS.
(8) PUPIL.
(10) MYOPIA.
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Similar Questions
Q1
Solve the following crossword with the help of the given clues:
Across
(1) A microscope consisting two convex lenses
(3) The jelly-like substances that fills the area of the eyeball between the retina and the lens.
(5) A lens mounted in a frame used to make an object appear layer than it really is
(7) The organ of the body with which humans are able to see
(9) The clear, watery fluid that fills the chamber of the eye between the cornea and the lens.
(11) An optical instrument used to view distant objects. It makes far away objects appear larger when viewed through it.
(12) Defect of human eye, by virtue of which a person can see clearly the distant objects but we the nearby objects.
Down
(1) The front transparent part of the eye that is bulged outwards. Light from objects enter the eye through it.
(2) An optical device consisting of a conve lens of small focal length that is used to make things.
(4) An apparatus for taking photographs.
(6) The flat-coloured membrane in the lens that contacts the size of the pupil
(8) The opening in the centre of the iris through wheels light enters the eye.
(10) The defect of human eye due to which a person is able to near objects at close range better than distant objects.
284398_3ba4ea7c89b84fa99778a59456171be9.png
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Q2

Statement 1: Hypermetropia is corrected by use of convex lens

Statement 2: The eye lens has to become thick so that it Hypermetropia (hyperopia) also known as farsightedness is a common type of refractive error where distant objects may be seen more clearly than objects that are near is able to bend light coming from a nearby object even more so as to form image at retina itself which a hypermetropic eye is unable to do so we place an extra convex lens which assists the eye lens in further convergence of light.


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Q3

Name the eye defect in which eye lens becomes cloudy or milky. Mention the method for its correction. A person uses a lens of power -1.0 D for correcting his distant vision and for correcting his near vision he uses a lens of power + 2.0 D. Calculate the focal length of the lenses required to correct these defects. Explain why a normal eye is not able to see clearly the objects placed closer than the near points.

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Q4

A simple telescope consisting of an objective lens of focal length 30 cm and that of its eye-lens is 3 cm. It is focused on a scale 2 metres distant from it. The distance of objective lens from eye-lens to see with relaxed eye is


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Q5
An object is placed at a distance of 30 cm from a converging lens of focal length 15 cm. A normal eye (near point 25 cm, far point infinity) is placed close to the lens on the other side. (a) Can the eye see the object clearly? (b) What should be the minimum separation between the lens and the eye so that the eye can clearly see the object? (c) Can a diverging lens, placed in contact with the converging lens, help in seeing the object clearly when the eye is close to the lens?
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