SCIENCE

LIGHT

Q.1 Fill in the blanks:-

 class 7 -light

(i) Light always travels in a ____________.

(ii) Change in direction of light after striking a polished surface is called ____________.

(iii) The phenomenon of left appearing right and right appearing left on reflection from a mirror is called _____________.

(iv) Real images are always ____________ while virtual images are always __________. (erect/inverted)

(v) The reflecting side of a concave mirror curves ____________ while the reflecting side of a convex mirror curves ______________ (inwards/outwards)

(vi) Concave mirrors from ____________ and ____________ images whereas the image formed by a convex mirror is always ____________ (real/virtual)

(vii) ____________ mirrors are used as rear/side view mirrors and ____________ mirrors are used as reflectors of headlights of vehicles.

(viii) A ____________ lens converges rays of light falling on it hence it is also called a ____________ lens.

(ix) A concave lens always forms a ____________ (real/virtual) image which is ____________ (erect/inverted) and ____________ (smaller/bigger) than the object.

(x) Formation of shadows suggest that light travels in __________ lines.

(xi) A __________ lens is thicker in the middle and tapering at the edges.