10th Samacheer Quiz

Q1. How is the thickness of a convex lens distributed?

Greater at the centre Greater at the edges Zero everywhere Equal only on both sides

Q2. Snell’s law relates:

Angle of incidence and angle of refraction Mass and weight Temperature and pressure Voltage and current

Q3. The power of a concave lens is generally:

Negative Positive Always zero Infinite

Q4. When an object is placed before a concave lens, the image is generally:

Real, inverted, enlarged Virtual, erect, diminished Real, erect, diminished Virtual, inverted, enlarged

Q5. When can an object appear to have no apparent bending due to refraction?

In media with matching refractive indices In any medium Only in vacuum Only in sunlight

Q6. A concave lens always forms an image that is:

Virtual, erect and diminished Real, inverted and enlarged Real and erect Only at infinity

Q7. If the refractive index is 1.5, what is the speed of light in the medium? (c = 3 × 10^8 m s⁻¹)

2 × 10^8 m s⁻¹ 4.5 × 10^8 m s⁻¹ 1.5 × 10^8 m s⁻¹ 3 × 10^8 m s⁻¹

Q8. What is the relation between wavelength and frequency of light in a given medium?

v = fλ v = f/λ f = vλ λ = vf²

Q9. If an object is between F and 2F of a convex lens, the image forms:

Beyond 2F Between F and lens At F Always on the same side

Q10. What is the far point of a normal human eye?

Infinity 25 cm 1 m 10 m

Optics