question_answer1) What are the reasons to believe that light is a wave motion?
question_answer4) Is it necessary that the amplitude be constant over a given wave front?
question_answer5) Can two wave-fronts cross one another? Give reason.
question_answer7) When a wave undergoes reflection at a denser medium, what happens to its phase?
question_answer8) If a wave undergoes refraction, what will be the phase change?
question_answer10) Define the term 'coherence' for light waves.
question_answer11) State the essential conditions for two light waves to be coherent.
question_answer12) State two conditions to obtain sustained interference of light.
question_answer14) Why are coherent sources necessary to produce a sustained interference pattern?
question_answer16) Two independent light sources cannot act as coherent sources'. Why?
question_answer20) Why should we have a narrow source to produce good interference fringes?
question_answer30) Explain the statement 'light added to light can produce darkness'.
question_answer35) Why does a soap bubble show beautiful colours when illuminated by white light?
question_answer36) Why does an excessively thin film appear black in reflected light?
question_answer37) Why do thick films not show interference effects?
question_answer39) State the essential condition for diffraction of light to occur.
question_answer45) What is the basic difference between interference and diffraction of light?
question_answer50) If light bends around obstacles, then why can't we see around a building?
question_answer53) Coloured spectrum is seen, when we look through a muslin cloth. Why?
question_answer56) What is the relation between magnifying power and resolving power of a telescope?
question_answer57) Why is the resolving power of a microscope having oil immersion objective high?
question_answer58) Which type of waves show the property of polarisation?
question_answer60) Will ultrasonic waves show any polarisation? Give reasons for your answer.
question_answer61) Why longitudinal waves cannot be polarised?
question_answer62) Light waves can be polarised while sound waves cannot. Why?
question_answer67) Does the value of polarising angle of incidence depend on the colour of light?
question_answer70) Sun glasses are made of polaroids and not of coloured glasses. Why?
question_answer71) Write two simple uses of polaroids.
question_answer73) Compare Maxwell's electromagnetic theory with Huygens' theory of light.
question_answer101) Distinguish between magnifying power and resolving power of a microscope.
question_answer102) Define the terms magnifying power and solving power of a telescope.
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