B7 3. (a) In a double-sit experiment, we need the twa sitts to act as monochromatic andcoherent sources of light. Ilow can we ensure cobtrence, if no laser is avallable 7(b) In such an experiment, d-2. If the Intensity due to one slit (a «e ) is l. caleulatethe intensities at 8-0, 0,-4.8'-sin(1/12), 0,-7.2'-sin"1(1/8), -9.6-sin'114-14.5'-sin'(1/4). Ploc 0) in the relevant range.

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3. (a) In a double-sit experiment, we need the twa sitts to act as monochromatic and coherent sources of light. How can we eEnsure cobtrence, if no laser is avallable ? (b) In such an experiment, d-2. If the Intensity due to one slit (a «e ) is l. caleulate the intensitles at 8=0, 0,-4,8"-sin(1/12), 0,-7.2-sini(1/8), g-9.6- sin(!/6 -14.5'-sin /4 Plor l) In the relevant range.

3. (a) In a double-sit experiment, we need the twa sitts to act as monochromatic and coherent sources of light. How can we eEnsure cobtrence, if no laser is avallable ? (b) In such an experiment, d-2. If the Intensity due to one slit (a «e ) is l. caleulate the intensitles at 8=0, 0,-4,8"-sin(1/12), 0,-7.2-sini(1/8), g-9.6- sin(!/6 -14.5'-sin /4 Plor l) In the relevant range.