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qUESTIONS

A car uses a convex mirror of curvature 1.2 m as its rear-view mirror. A minibus of cross section 2.2 m x 2.2 m is 6.6 m away from the mirror. Estimate the image size.

A rectangular sheet of length 30 cm and breadth 3 cm is kept on the principal axis of a concave mirror of focal length 30 cm. Draw the image formed by the mirror on the same diagram, as far as possible on scale.

Estimate the number of images produced if a tiny object is kept in between two plane mirrors inclined at 35º, 36°, 40° and 45°.

A thin pencil of length 20 cm is kept along the principal axis of a concave mirror of curvature 30 cm. Nearest end of the pencil is 20 cm from the pole of the mirror. What will be the size of image of the pencil?

A small object is kept symmetrically between two plane mirrors inclined at 38°. This angle is now gradually increased to 41°, the object being symmetrical all the time. Determine the number of images visible during the process.

EThickness of the glass of a spectacle is 2 mm and refractive index of its glass is 1.5. Calculate time taken by light to cross this thickness. Express your answer with most convenient prefix attached to the unit second’.

The sound emitted from the siren of anambulance has frequency of 1500 Hz.The speed of sound is 340 m/s. Calculatethe difference in frequencies heard bya stationary observer if the ambulanceinitially, travels towards and then awayfrom the observer at a speed of 30 m/s.

A certain sound wave in air has a speed340 m/s and wavelength 1.7 m for this wave, calculate a) the frequency b) the period.

A police car travels towards a stationaryobserver at a speed of 15 m/s. The sirenon the car emits a sound of frequency 250Hz. Calculate the recorded frequency.The speed of sound is 340 m/s.

A man standing between 2 parallel liffsfires a gun. He hears two echos oneafter 3 seconds and other after 5 seconds.The separation between the two cliffs i1s1360 m, what is the speed of sound?

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