Light incident normally on a plane mirror attached to a galvanometer coil retraces backward as shown in the figure. A current in the coil produces a deflection of 3.5° of the mirror. What is the displacement of the reflected spot of light on a screen placed 1.5 m away? (tan 7 °=0.1228)
1. 15.0 cm
2. 18.4 cm
3. 21.2 cm
4. 12.5 cm
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyMonochromatic light of wavelength \(589\) nm is incident from the air on a water surface. What is the wavelength of reflected light? The refractive index of water is \(1.33\).
1. \(500\) nm
2. \(545\) nm
3. \(485\) nm
4. \(589\) nm
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyLight of wavelength \(5000~\mathring{A}\) falls on a plane reflecting surface. For what angle of incidence is the reflected ray normal to the incident ray?
1. \(37^{\circ}\)
2. \(45^{\circ}\)
3. \(90^{\circ}\)
4. \(0^{\circ}\)
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology