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Presbyopia and Its Correction

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Question

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(1) A ray of light parallel to principal axis after reflection from concave mirror passes through ___

(2) The focal length of _ lens is positive.

(3) The image of an object is formed behind _ in hypermetropia.

(4) An optical device used by watch repairers is _

(5) The power of spectacle for myopic eye is_____.

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Solution

(1) A ray of light parallel to principal axis after reflection from concave mirror passes through the focus.

(2) The focal length of concave lens is positive.

(3) The image of an object is formed behind retina in hypermetropia.

(4) An optical device used by watch repairers is simple microscope.

(5) The power of spectacle for myopic eye is negative.

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Q. A ray of light parallel to principal axis after reflection from concave mirror passes through ___________.

State whether the following statements are 'true' or 'false' by writing T/F against them.

(a) A convex lens has a divergent action and a concave lens has a convergent action.

(b) A concave lens, if kept at a proper distance from an object, can form its real image.

(c) A ray of light incident parallel to the principal axis of a lens, passes undeviated after refraction.

(d) A ray of light incident at the optical centre of lens, passes undeviated after refraction.

(e) A concave lens forms a magnified or diminished image depending on the distance of object from it.

Q. A ray of light parallel to the principal axis of a concave mirror, after reflection, passes through:

Q. A convex lens of focal length 20 cm is placed coaxially with a concave mirror of focal length 10 cm, at a distance 50 cm apart from each other. A beam of light coming parallel to the principal axis is incident on the convex lens. Find the position of the final image formed by this combination. Draw the ray diagram showing the formation of the image.

Q. State whether the following statements are true or false. Rewrite the false statements correctly.
(a) The laws of reflection hold good only for plane mirrors and not for spherical mirrors.
(b) The radius of curvature is double the focal length of a concave mirror.
(c) A ray passing through the focus cuts through the principal axis of a concave mirror after reflection.
(d) When an object is placed between a concave mirror and its focus, the image formed is virtual, erect and larger than the object.
(e) The image formed on a cinema screen is virtual.
(f) A convex mirror is used by stage artists.
(g) A convex mirror always gives real images.
(h) A pinhole camera gives a real image.
(i) A convex surface bulges inwards.
(j) Incident rays parallel to the principal axis of a curved mirror pass through the focus after reflection.
(k) A concave mirror always forms a real image.
(l) There can be many reflected rays for a single incident ray falling on a reflecting surface.

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