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Class X >> Science >> Light - Reflection and Refraction >> A1

Q1	Surface of the spoon bulged __________ can be approximated to a __________ mirror.
A	Outward, Convex
B	Outward, Concave
C	Inwards, Convex
D	Both (B) and (C)

Q2	The power of a lens is defined as the __________ of its focal length.
A	Half
B	Twice
C	Equal
D	Reciprocal

Q3	The SI unit of power of a lens is __________.
A	Joule/Second
B	Metre
C	Dioptre
D	Watt

Q4	Distance from pole to principal focus is called __________ of given mirror.
A	Refractive Index
B	Radius of Curvature
C	Focal Length
D	Centre of Curvature

Q5	__________ is a phenomenon in which the incident light falling on a surface is sent back into the same medium.
A	Absorption
B	Polarisation
C	Reflection
D	Refraction

Q6	Which of the property is NOT true regarding image formed by a plane mirror?
A	Virtual and Erect
B	Real and Erect
C	Equal in Size of the Object
D	Laterally Inverted

Q7	The study of light and the interaction of light and matter is called __________.
A	Acoustics
B	Optics
C	Ophthalmology
D	Optometry

Q8	Radius of curvature is __________ of focal length of mirror.
A	Twice
B	Half
C	One Quarter
D	Four Times

Q9	A spherical mirror, whose reflecting surface is curved __________ is called a __________ mirror.
A	Inwards, Concave
B	Outward, Concave
C	Inward, Convex
D	Both (B) and (C)

Q10	Power of a convex and concave lens is __________.
A	Positive and Negative Respectively
B	Negative and Positive Respectively
C	Positive
D	Negative

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