BSSC Inter Level · General Science
Reflection, refraction, lenses and optical instruments.
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Q1 · Light and Optics · EASY
A ray of light strikes a plane mirror at an angle of 30 degrees to the mirror surface. What is the angle of reflection measured from the normal to the mirror?
Q2 · Light and Optics · EASY
A pencil is placed in a glass of water. When viewed from above, the pencil appears bent at the water surface. This phenomenon is due to:
Q3 · Light and Optics · MEDIUM
A convex lens of focal length 20 cm is used to form an image of an object placed 30 cm from the lens. What is the position of the image from the lens?
Q4 · Light and Optics · HARD
A compound microscope has an objective lens of focal length 2 cm and an eyepiece of focal length 5 cm. The two lenses are separated by 20 cm. An object is placed 2.5 cm from the objective lens. What is the magnifying power of the microscope if the final image is formed at the near point (25 cm from the eye)?
Q5 · Light and Optics · EASY
A concave mirror is used by a dentist primarily because it produces: