Username*
E-Mail*
Password*
Confirm Password*
Captcha* Click on image to update the captcha.
Username or email*
Lost your password? Please enter your email address. You will receive a link and will create a new password via email.
You must login to ask question.
(b) 30 cm in front of the mirror
(a) A convex lens has 4 dioptre power having a focal length 0.25 m
(d) Convex lens
(c) When object is placed between the focus and center of curvature
(b) - 20 cm
(b) – 20 cm
(a) Concave mirror as well as convex lens
(a) both are concave
(d)180-2θ
(c) larger
(c) dioptre
Rays from Sun converge at a point 15 cm in front of a concave mirror. Where should an object be placed so that size of its image is equal to the size of the object?
(b) 30 cm in front of the mirror
(b) 30 cm in front of the mirror
See lessWhich of the following statements is/are true?
(a) A convex lens has 4 dioptre power having a focal length 0.25 m
(a) A convex lens has 4 dioptre power having a focal length 0.25 m
See lessA beam of light is incident through the holes on side A and emerges out of the hole on the other face of the box as shown in the figure. Which of the following could be inside the box?
(d) Convex lens
(d) Convex lens
See lessUnder which of the following conditions a concave mirror can form an image larger than the actual object
(c) When object is placed between the focus and center of curvature
(c) When object is placed between the focus and center of curvature
See lessA l0 mm long awl pin is placed vertically in front of a concave mirror. A5 mm long image of the awl pin is formed at 30 cm in front of the mirror. The focal length of this mirror is
(b) - 20 cm
(b) – 20 cm
See lessWhich of the following can make a parallel beam of light when light from a point source is incident on it?
(a) Concave mirror as well as convex lens
(a) Concave mirror as well as convex lens
See lessA spherical minor and a thin spherical lens have each a focal length of -15 cm. The mirror and the lens are likely to be:
(a) both are concave
(a) both are concave
See lessThe angular deviation (θ) associated with a ray of light falling on a spherical mirror is…………..
(d)180-2θ
(d)180-2θ
See lessConvex mirrors have………….lens is field of view in comparison to concave mirrors.
(c) larger
(c) larger
See lessThe SI unit of power of a lens is……………..
(c) dioptre
(c) dioptre
See less