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Reflection Test - 9
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Reflection Test - 9
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  • Question 1/10
    1 / -0

    If a spherical mirror is immersed in a liquid, its focal length will:

    Solutions

    Focal length is the property of the spherical mirror. So, it does not changes when immersed in liquid.

     

  • Question 2/10
    1 / -0

    An object is placed at a distance of 40 cm in front of a concave mirror of focal length 20 cm. The image produced is:

    Solutions

    Object distance, u = −40cm

    Focal length, f = −20cm

    According to mirror formula,

    Negative sign shows that image is infront of concave mirror.

    The image is real.

    The image is of the same size and inverted. 

     

  • Question 3/10
    1 / -0

    An object 5 cm tall is placed 1 m from a concave spherical mirror which has a radius of curvature of 20 cm. The size of the image is:

    Solutions

    Object distance, u=−1 m

    Focal length, f=−10 cm

    Using mirror formula, 

     

  • Question 4/10
    1 / -0

    Sun subtends an angle of 0.5o at the pole of a concave mirror of radius of curvature 15 m. The diameter of the image of the sun formed by the mirror is

    Solutions

     

  • Question 5/10
    1 / -0

    The focal length of a concave mirror is 12 cm. Where should an object of length 4 cm be placed, so that a real image of 1 cm length is formed?

    Solutions

    Given that,

    Focal length of a concave mirror f = 12cm

    Object length h = 4

    Real image length h′=1cm

    We know that,

     

  • Question 6/10
    1 / -0

    The focal length of a concave mirror is 20cm. Determine where an object must be placed to form an image magnified two times when the image is real

    Solutions

     

  • Question 7/10
    1 / -0

    Given a point source of light, which of the following can produce a parallel beam of light

    Solutions

     

  • Question 8/10
    1 / -0

    A convex mirror is used to form an image of a real object. Then mark the wrong statement.

    Solutions

    In case of a real object, a convex mirror will always form a diminished, virtual and erect image which lies between focus and pole.

     

  • Question 9/10
    1 / -0

    The largest distance of the image of a real object from a convex mirror of focal length 20 cm can be

    Solutions

    We are given that:

    Focal length = 20 cm

    In a convex mirror image is formed between focal length and mirror.

    So the maximum distance is f i.e. focal length of the mirror.  

    Now

    f = 20 / 2 = 10 cm

    Thus the largest distance of an image from a convex mirror is 10 cm.

     

  • Question 10/10
    1 / -0

    An object is placed at a distance of 25cm from the pole of a convex mirror and a plane mirror is set so that the virtual images formed by two mirrors do not have any parallax. The plane mirror is 20cm from the object. The focal length of the mirror is

    Solutions

    For plane mirror, image is formed 20cm behind it as the object is 20cm in front of it. For convex mirror, Plane Mirror,

     

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