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    Class 12 Ch-09 Ray Optics DPP-02 (UNACADEMY)

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    tanishasainits2
    1. A ray of light takes 10-9 second to cross a glass slab of thickness 0.1 m and refractive index 1.5. 2. The time taken for light to travel a certain distance in air is 9 × 10-6 seconds, and in water of refractive index 4/3 is 27 × 10-6 seconds. 3. Light passing through a glass slab of thickness 90 cm with refractive index 3/2 takes a time t1, while the same distance in water of refractive index 4/3 takes a time t2, where t1 - t2 is equal to 5 × 10-10 seconds.

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    Class 12 Ch-09 Ray Optics DPP-02 (UNACADEMY)

    Uploaded by

    tanishasainits2
    39 views1 page
    1. A ray of light takes 10-9 second to cross a glass slab of thickness 0.1 m and refractive index 1.5. 2. The time taken for light to travel a certain distance in air is 9 × 10-6 seconds, and in water of refractive index 4/3 is 27 × 10-6 seconds. 3. Light passing through a glass slab of thickness 90 cm with refractive index 3/2 takes a time t1, while the same distance in water of refractive index 4/3 takes a time t2, where t1 - t2 is equal to 5 × 10-10 seconds.

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    1. A ray of light takes 10-9 second to cross a glass slab of thickness 0.1 m and refractive index 1.5. 2. The time taken for light to travel a certain distance in air is 9 × 10-6 seconds, and in water of refractive index 4/3 is 27 × 10-6 seconds. 3. Light passing through a glass slab of thickness 90 cm with refractive index 3/2 takes a time t1, while the same distance in water of refractive index 4/3 takes a time t2, where t1 - t2 is equal to 5 × 10-10 seconds.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    39 views1 page

    Class 12 Ch-09 Ray Optics DPP-02 (UNACADEMY)

    Uploaded by

    tanishasainits2
    1. A ray of light takes 10-9 second to cross a glass slab of thickness 0.1 m and refractive index 1.5. 2. The time taken for light to travel a certain distance in air is 9 × 10-6 seconds, and in water of refractive index 4/3 is 27 × 10-6 seconds. 3. Light passing through a glass slab of thickness 90 cm with refractive index 3/2 takes a time t1, while the same distance in water of refractive index 4/3 takes a time t2, where t1 - t2 is equal to 5 × 10-10 seconds.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    of 1

    UNACADEMY

    CLASS 12 CH-09 RAY OPTICS DPP-02

    1. A ray of light takes 10−9 second to cross a glass slab 6. by the same monochromatic light. If the refractive
    4
    of refractive index 1.5. The thickness of the slab w index of water is , What is that of glass?
    3
    (1) 0.1 m 5
    (1)
    (2) 0.2 m 3
    5
    (3) 0.3 m (2)
    4
    (4) 0.4 m 16
    (3)
    15
    3
    2. The time taken by a monochromatic light to travel a (4)
    2
    certain distance in air in 9 × 10−6 seconds. The time
    taken by the light ray to travel the same distance in water 7. Light travels with velocities 2 × 108 ms −1 and
    4
    of refractive index is 2.5 × 108 ms −1 through two different media. The
    3
    (1) 12 s critical angle of the two media is
    1
    (2) 12 μs (1) sin−1 ( )
    5
    27 4
    (3) μs (2) sin −1
    ( )
    4 5
    27
    (4) μs (3) sin −1
    ( )
    1
    2
    2
    −1 2
    (4) sin ( )
    3. A monochromatic light passes through a glass slab 3
    3
    (μ = ) of thickness 90 cm in time t1 . If it takes a time
    2 8. Light takes t1 second to travel a distance x cm in
    4
    t 2 to travel the same distance through water (μ = ). vacuum and the same light takes t 2 second to travel 10x
    3
    The value of (t1 − t 2 ) is cm in medium. The critical angle for the corresponding
    (1) 5 × 10−8 s medium is
    10t2
    (2) 5 × 10−10 s (1) sin−1 [ ]
    t1
    (3) 2.5 × 10−10 s t2
    (2) sin−1 [ ]
    (4) 2.5 × 10−8 s 10t1
    −1 10t1
    (3) sin [ ]
    t2
    4. A beam of light is partially reflected and partially
    −1 t1
    refracted from a surface. The angle between reflected (4) sin [ ]
    10t2
    and refracted light ray is 90°. If the angle of refraction
    is 30°, the angle of incidence is 9. A fish is a little away below the surface of a take. If
    (1) 60° the critical angle is 49°, then the fish could see things
    (2) 48° above the water surface within an angular range of
    (3) 45° (1) θ = 49°
    (4) 90° (2) θ = 90°
    (3) θ = 98 °
    5. A small object is placed 20 cm in front of a block of (4) θ = 24.5°
    glass 10 thick and its farther side silvered. The image is
    formed 22 cm behind the silvered face. Find the
    refractive index of glass.
    (1) 1.15
    (2) 125
    (3) 1.67
    (4) 1.1

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