Question:
Which one of the sets of observations is not correct and why?
Which one of the sets of observations is not correct and why?
Show Hint
In ray diagrams for convex lenses, light rays diverging from an object parallel to the optical axis are refracted through the focal point on the opposite side.
Updated On: Jan 31, 2026
Hide Solution
Verified By Collegedunia
Solution and Explanation
- Observation (2) shows an image distance of +20 cm for an object distance of -60 cm. This is not correct because the image formed by a convex lens should be at a larger distance when the object is placed farther away.
The correct relationship should show the image moving towards the focal point as the object distance decreases.
Thus, observation (2) seems to be incorrect.
Was this answer helpful?
0
1
Top Questions on Optics
- A thin convex lens of focal length \( 5 \) cm and a thin concave lens of focal length \( 4 \) cm are combined together (without any gap), and this combination has magnification \( m_1 \) when an object is placed \( 10 \) cm before the convex lens.
Keeping the positions of the convex lens and the object undisturbed, a gap of \( 1 \) cm is introduced between the lenses by moving the concave lens away. This leads to a change in magnification of the total lens system to \( m_2 \).
The value of \( \dfrac{m_1}{m_2} \) is
The strain-stress plot for materials A, B, C and D is shown in the figure. Which material has the largest Young's modulus?
- A thin prism with angle 5° of refractive index 1.72 is combined with another prism of refractive index 1.9 to produce dispersion without deviation. The angle of second prism is :
- A convex lens of refractive index \(1.5\) and focal length \(f=18\) cm is immersed in water. The difference in focal lengths of the given lens when it is in water and in air is \( \alpha \times f \). Find the value of \( \alpha \). (Given: refractive index of water \(=\dfrac{4}{3}\))
- Given below are two statements: Statement I: A plane wave after passing through a prism remains a plane wave, but passing through a small pin hole may become a spherical wave. Statement II: The curvature of a spherical wave emerging from a slit will increase for increasing slit width. In the light of the above statements, choose the correct answer:
View More Questions
Questions Asked in CBSE X exam
- Identify from the following the ray diagram which shows the correct path of the reflected ray for the ray incident on a concave mirror as shown:
- CBSE Class X - 2025
- Light - Reflection and Refraction
परंपरागत भोजन को लोकप्रिय कैसे बनाया जा सकता है ?
i. उपलब्ध करवाकर
ii. प्रचार-प्रसार द्वारा
iii. बिक्री की विशेष व्यवस्था करके
iv. घर-घर मुफ्त अभियान चलाकर विकल्प:- CBSE Class X - 2025
- गद्यांश पर आधारित प्रश्न
- The distance of the point A($-3$, $-4$) from x-axis is
- CBSE Class X - 2025
- Coordinate Geometry
- In a right-angled triangle ABC at A, if \(\sin B = \frac{1}{4}\), then the value of \(\sec B\) is:
- CBSE Class X - 2025
- Trigonometry
- Complete the statement made by a career counsellor by filling the blank with the correct option:
In our country, __ universities offer a range of courses. That’s why foreign students prefer Indian universities.- CBSE Class X - 2025
- Fill in the Blanks
View More Questions