Question 11 MarkTotal internal reflection occurs only when a ray of light passes from a ___________ [rarer/denser] medium to a ___________ [rarer/denser] medium.Answerdenser, rarerView full question & answer→
Question 21 MarkFor an object placed at a distance 30 cm in front of a convex lens, the image is at a distance 30 cm behind the lens. The focal length of the convex lens is ___________ [ $30 cm / 20 cm / 15 cm]$.Answer15 cmView full question & answer→
Question 31 MarkThe focal length of a thin convex lens is ___________ [less than/more than/equal to] that of a thick convex lens.Answermore thanView full question & answer→
Question 41 MarkThe critical angle for glass-air interface is ___________ $\left[48^{\circ} / 45^{\circ} / 42^{\circ}\right]$Answer$42^{\circ}$View full question & answer→
Question 51 MarkWhen light travels from a rarer to a denser medium, its speed ___________ [increases/decreases/does not change].AnswerdecreasesView full question & answer→