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Refraction through a Glass Slab Video Lecture | Physics for JAMB

FAQs on Refraction through a Glass Slab Video Lecture - Physics for JAMB

1. What is refraction?

Ans. Refraction is the bending of light as it passes from one medium to another, such as from air to a glass slab. This bending occurs due to the change in speed of light as it travels through different mediums.

2. How does refraction occur in a glass slab?

Ans. Refraction occurs in a glass slab when light enters it from one medium, like air, and crosses the boundary into the glass. The speed of light decreases in the glass, causing it to bend towards the normal (an imaginary line perpendicular to the surface of the glass) as it enters. When the light exits the glass slab, it bends away from the normal and returns to its original path.

3. What factors affect the amount of refraction in a glass slab?

Ans. The amount of refraction in a glass slab is influenced by the angle of incidence (the angle at which light enters the slab), the refractive indices of the two mediums (air and glass), and the shape of the glass slab. The greater the difference in refractive indices between the two mediums, the greater the amount of refraction.

4. What is the relationship between the incident angle and the refracted angle in refraction through a glass slab?

Ans. The incident angle and the refracted angle are related by Snell's law. According to Snell's law, the ratio of the sine of the incident angle to the sine of the refracted angle is equal to the ratio of the refractive indices of the two mediums. Mathematically, this can be represented as n1 sin(theta1) = n2 sin(theta2), where n1 and n2 are the refractive indices of the initial and final mediums, and theta1 and theta2 are the incident and refracted angles, respectively.

5. What are some practical applications of refraction through a glass slab?

Ans. Refraction through a glass slab has various practical applications. It is used in the manufacturing of lenses for corrective eyewear, microscopes, telescopes, and cameras. It is also utilized in optical instruments like spectrometers and prisms. Additionally, refraction through glass slabs plays a significant role in fiber optics, where it enables the transmission of digital data through thin glass fibers.

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Sep 08, 2025 Last updated

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