General instructions same as in chapter 1.
Assertion:Corpuscular theory fails in explaning the velocities of light in air and water.
Reason:According to corpuscular theory, light should travel faster in denser medium than in rarer medium.

In these question, a statement of asertion followed by a statement of reason is given .Choose the correct answer out of the following choices: Assertion and reason both are correct statements and reason is correct explanation for assertion. Assertion and reason both are correct statements but reason is not correct explanation for assertion. Assertion is correct statement but reason is wrong statement. Assertion is wrong statement but reason is correct statement. Assertion:Corpuscular theory fails in explaining the velocities of light in air and water. Reaon:According to corpuscular theory,light should travel faster in denser media than in rarer media.

General instructions same as in chapter 1. Assertion:Bohr had to postulate that electrons in the stationary orbts around the nucleus do not radiate. Reason:According to classical physcis all moving electrons radiate.

General instruction same as in chapter 1. Assertion:If we look through a muslin cloth, a coloured spectrum is seen. It is due to diffraction of white light on passing through fine slits.

Given instructions same as in chapter 1. Assertion: Photoelectric effect demonstrates the particles nature of light. Reason:The number of photoelectrons is proportional to the frequency of light.

Given instructions same as in chapter 1. Assertion: Any substance can be used for the emission of photoelectrons. Reason: Radiations of suitalbe frequency (more than threshold frequency) should be available.

Given instructions same as in chapter 1. Assertion: For photoelectric effect to take place, the frequency of incident of incident radiations should be more than threshold frequency of a given metal Reason: 1/2 mv^2=h(v-v_0) .

In these question, a statement of assertion followed by a statement of reason is given .Choose the correct answer out of the following choices: Assertion and reason both are correct statements and reason is correct explanation for assertion. Assertion and reason both are correct statements but reason is not correct explanation for assertion. Assertion is correct statement but reason is wrong statement. Assertion is wrong statement but reason is correct statement. Assertion: the frequencies of incident ,reflected and refracted beam of monochromatic light incident from one medium to another are same. Reason: The incident, reflected and refracted rays are coplanar.

Explain how Corpuscular theory predicts the speed of light in a medium, say, water, to be greater than the speed of light in vacuum. Is the prediction confirmed by experimental determination of the speed of light in water ? If not, which alternative picture of light is consistent with experiment?

each question constain STATEMENT-1(Assertion ) and STATEMENT - 2 (reason). examine the statement carefully and each question constain STATEMENT-1(Assertion ) and STATEMENT - 2 (reason). examine the statement carefully and work the correct answer accoridng to the instructions given below : STATEMENT-1: Sky appears blue in colour. STATEMENT-2: Colloidal particles of dust along with water suspended in air scatter blue light.

For a ray of light travelling from a denser medium of refractive index mu_1 to a rarer medium of refractive index mu_2 ,prove that (mu_2)/(mu_1) = sin C , where C is the critical angle of incidence for the media.