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No image on the screen.
Increases
Away from the lens
(l) Brisk effervescence (ii) Evolution of a colourless gas NaHCO3 + CH3COOH ------- CH3COONa + H2O + CO2
(l) Brisk effervescence (ii) Evolution of a colourless gas NaHCO3 + CH3COOH ——- CH3COONa + H2O + CO2
(c) R
What happens when he moves the object very close to the lens?
No image on the screen.
No image on the screen.
See lessWhat happens to the size of image – does it increase or decrease?
Increases
Increases
See lessIn which direction – towards or away from the lens, does he move the screen to focus the object?
Away from the lens
Away from the lens
See lessList two observations which you make when you add a pinch of sodium hydrogen carbonate to acetic acid in a test tube. Write chemical equation for the reaction that occurs.
(l) Brisk effervescence (ii) Evolution of a colourless gas NaHCO3 + CH3COOH ------- CH3COONa + H2O + CO2
(l) Brisk effervescence
See less(ii) Evolution of a colourless gas
NaHCO3 + CH3COOH ——- CH3COONa + H2O + CO2
Four students P, Q, R and S traced the path of a ray of light passing through a glass slab for an angle of incidence of 40″ and measured the angle of refraction. The values as measured by them were 18″, 22″;25″ and 30″ respectively. The student who has performed the experiment methodically is
(c) R
(c) R
See less